A historical English prayer collected in Prayers of the Middle Ages: Light from a Thousand Years, edited by J. Manning Potts.
Historical edition. Historical claims and instructions are preserved as historical context.
O most merciful Lord, grant to me Thy grace, that it may be with me, and labor with me, and persevere with me even to the end. Grant that I may always desire and will that which is to Thee most acceptable, and most dear. Let Thy will be mine, and my will ever follow Thine, and agree perfectly with it. Grant to me, above all things that can be desired, to rest in Thee, and in Thee to have my heart at peace. Thou art the true peace of the heart, Thou its only rest; out of Thee all things are hard and restless. In this very peace, that is, in Thee, the one Chiefest Eternal Good, I will sleep and rest. Amen.