For Perseverance

Look on us and hear us,
O Lord our God,
and help us to please you
as we do the work you have given to us.
As you have given the first act of will,
so give the completion of the work.
Give us strength to finish
what you have moved us to begin;
through Jesus Christ our Lord. Amen.

Source: Mozarabic Liturgy

Source of this version: Freely modified from Prayers of the Middle Ages, edited by J. Manning Potts, 1954