Create in me a pure heart, O God, and renew a steadfast spirit within me.
Psalm 51 v 10
Pure means to be clean, blameless, unstained from guilt. Biblically your heart is where your thoughts, desires, sense of purpose, will, understanding, and character reside. So being pure in heart involves having a singleness of heart toward God.
What takes you away from being single-minded about God? Pray this Bible verse as a prayer and seek daily to renew your walk with God.
I come to you Father, acknowledging my longing after you.
I come to you Son of the Father, acknowledging that my sin has met the cross.
I come to you Spirit, asking you to fill me so that I may keep my place of ministry in bringing the world to a full confession of its own.
To you, merciful Father, I pray,
against you have I sinned and done what is evil in your sight.
To you, merciful Son of the Father, I pray,
wash away all my iniquity and cleanse me from my sin.
To you, merciful Spirit, I pray,
create in me a pure heart.