Palm Sunday commemorates the triumphal entry of Jesus into Jerusalem (Matthew 21:1–11, Mark 11:1–11, Luke 19:28–44, John 12:12–19) and opens Holy Week. All four Gospels record the event: Jesus riding into the city on a donkey in deliberate fulfillment of Zechariah 9:9, the crowds spreading garments and branches on the road, and the acclamation 'Hosanna to the Son of David! Blessed is he who comes in the name of the Lord!' The palm branches, mentioned explicitly only in John's Gospel, gave the day its name; the other Synoptic writers mention 'branches cut from the fields' (Mark 11:8) or 'their cloaks' (Luke 19:36). The liturgical observance is ancient. The pilgrim Egeria, writing around 384, provides the earliest detailed description of a Palm Sunday procession in Jerusalem: the bishop rode from the Mount of Olives into the city while the people carried palm and olive branches, and children too young to walk were carried on their parents' shoulders, all singing 'Blessed is he who comes in the name of the Lord.' This Jerusalem stational liturgy — procession from a site outside the city through the gates — became the model for Palm Sunday observances throughout Christendom. By the seventh century, the practice had spread throughout the Western churches. The Bobbio Missal (7th c., Gallican rite) attests Gallican influence on the introduction of palm blessing into Western liturgy, and the ninth-century Romano-Germanic Pontifical codified the full Western pattern of palm blessing, procession, and Passion Gospel that persists in recognizable form to this day.

Palm Sunday is unique among liturgical days in sustaining two contrasting moods within a single service. The BCP 2019 preserves this ancient pattern: the liturgy begins outdoors (or at a station apart from the main church) with the blessing of palms, the reading of the Triumphal Entry Gospel, and a procession into the church with hymns of praise — typically 'All Glory, Laud, and Honor' (Theodulph of Orléans, 820). But once the congregation enters the church, the tone shifts sharply. The Eucharistic Gospel is the full Passion narrative from one of the Synoptic Gospels (rotating by lectionary year: Matthew in Year A, Mark in Year B, Luke in Year C — John's Passion is reserved for Good Friday). The congregation that moments ago cried 'Hosanna' now speaks the words of the crowd calling for crucifixion. This liturgical reversal — from royal welcome to the demand for blood — enacts the central paradox of the Passion: the King who was received with palms was dead by Friday. The BCP's introductory rubric makes the theological point explicit: 'We who hail Jesus as King one moment, may in the next deny him, even joining with the crowd in shouting, "Crucify him!"' The color is red — for the Passion, not for Pentecostal fire. Some parishes use violet through the early days of Holy Week and switch to red for the Triduum, but Palm Sunday itself takes red because the Passion Gospel dominates the Eucharistic liturgy. The palms distributed to the congregation have generated their own devotional tradition: many Christians keep their palms throughout the year, and the custom of burning the previous year's palms to produce ashes for Ash Wednesday creates a beautiful liturgical cycle linking the two days.

William Law was born in 1686 at King's Cliffe, Northamptonshire, the son of a grocer of respectable standing. He received an excellent education at Grantham School and at Emmanuel College, Cambridge, where he developed the classical learning and theological acuity that would mark his mature work. After ordination and election as a fellow of Emmanuel College, he served as chaplain and tutor—positions that promised a distinguished academic ecclesiastical career.

His life took a sudden and defining turn in 1714 when he refused to take the oath of allegiance to George I, declaring his conscience bound to the Stuart line. This act of principled nonjury cost him his fellowship and any possibility of preferment in the Church of England. Rather than retreat into obscurity, Law relocated to London, where he supported himself as a private tutor. He served for several years in the household of Edward Gibbon, grandfather of the historian, as chaplain and domestic tutor—a position that provided both security and the leisure to write.

During this period of apparent restriction, Law produced his greatest works. A Treatise upon Christian Perfection appeared in 1726, but it was A Serious Call to a Devout and Holy Life (1728) that would reshape Anglican spirituality and influence the broader Protestant world. The Serious Call is remarkable for its combination of theological sophistication, moral clarity, and vivid character portraiture. Law populated its pages with satirical yet sympathetic portraits—Flavia the fashionable woman, Calidus the businessman preoccupied with worldly gain, Miranda the truly devout—showing how ordinary Christians either evade or embrace the radical demands of Gospel charity and holiness.

The book's impact was immediate and profound. Samuel Johnson, then a young man adrift in spiritual uncertainty, credited reading the Serious Call with making him 'think in earnest of religion' for the first time. John Wesley reported that Law's teaching shaped his understanding of holiness and Christian perfection, though Wesley later diverged from Law's theology on several points. George Whitefield acknowledged Law's formative influence on his own spiritual awakening. The Serious Call became standard reading for Anglican ordinands, devout laity, and educated dissenting ministers throughout the eighteenth and nineteenth centuries. Its influence extended to figures as diverse as Samuel Taylor Coleridge and the Tractarian theologians of the nineteenth century.

In his mature years, Law returned to King's Cliffe, where he lived with extraordinary simplicity and ascetic discipline. He devoted himself to prayer, charitable work among the poor of the parish, and deep study of the German mystical theologian Jakob Böhme. This turn toward mysticism puzzled some contemporaries who had known him only through the moral and intellectual rigor of the Serious Call. To Law, however, there was no contradiction: the God who demands holy living and moral transformation is the same God who draws the soul into deeper union and contemplative knowledge. His later writings—The Spirit of Prayer (1749) and The Spirit of Love (1754)—explored this interior dimension of faith, seeking to show how systematic prayer and mystical awareness interpenetrate.

Law died peacefully at King's Cliffe on April 9, 1761, in his seventy-fifth year, having lived as a living embodiment of the devout and austere Christianity he had commended to others.

Traditionally, Law is remembered as a model of spiritual integrity and intellectual rigor in prayer. His insistence that Christianity demands the transformation of the whole person—commerce, dress, conversation, leisure—rather than sequestering piety to private devotion was revolutionary in its scope and influential across denominational lines. The tradition emphasizes not only his moral clarity but his growth into contemplative depth in his later years, suggesting that rigorous asceticism naturally flowers into mystical union rather than remaining sterile discipline.

Contemporaries and successors highlighted Law's personal integrity: he lived according to the demanding standards he commended in writing, neither accumulating wealth nor seeking preferment. His return to King's Cliffe and his dedicated charitable work among the poor established him as a figure of voluntary simplicity and genuine pastoral concern. Later Anglican tradition identified him as a precursor to the Tractarian movement, which similarly emphasized the integration of rigorous theological learning with deep spirituality and ascetic practice.

Law's influence extended beyond the Church of England. His writings were read and revered by Methodist, Presbyterian, and Congregationalist clergy. In the nineteenth century, Coleridge, the Tractarians, and later figures in the Catholic Revival found in Law a resource for integrating mysticism with Anglican ecclesiology and theology.