A Pure Heart

O God Almighty,
the Father of your Christ, your only Son,
give me a body undefiled,
a heart pure,
a watchful mind,
an unerring knowledge,
the influence of the Holy Spirit
for the obtaining and assured enjoying of the truth;
through your Christ,
by whom glory be to you in the Holy Spirit,
forever. Amen.

Source: The Clementine Liturgy

Source of this version: Freely modified from Prayers of the Early Church, edited by J. Manning Potts, 1953