Here is a prayer from fifteenth century German-Dutch Canon, Thomas à Kempis (1380-1471):

Above all things and in all things, O my soul, rest always in God,
for He is the everlasting rest of the saints.
Grant, most sweet and loving Jesus, that I may seek my repose in You…
For my heart cannot rest or be fully content until,
rising above all gifts and every created thing,
it rests in You. Amen.