This is the will of God, your sanctification.
1 Thessalonians 4:3
Being born of God demands purification. Sin may enter our minds but calls for immediate meditation. “I will meditate on your precepts and fix my eyes on your ways” (Ps. 119:15). Jesus positions us in righteousness at the moment of conversion, but we must never stand stationary. Every moment is an opportunity for obedience. At the onset of temptation, fix your eyes on Jesus. A continual lack of purity is evidence of not being God’s child.
Pray to be purified.