How will I be able to live all my life away from sin when my heart loves it? If I repent, I will return to it!
The false notion by which Satan instills despair into your heart is that you will live in repentance with the same heart that loves sin! No, not at all, for God “will give you a new heart” (Ez.36:26), and He will uproot the love of sin from you. Then you will never consider returning to sin, but on the contrary, God will cause you in your repentance, to hate and abhor sin. Your present feelings will change.
Even if I repent, my thoughts will be stained with former images
Do not fear. In repentance, God will cleanse your mind and you will attain the “renewing of your mind” of which the Apostle spoke in his epistle to the Romans (Rom. 12:2). How numerous were the bad images in the memory of Augustine and in the memory of Mary of Egypt! But the Lord wiped them away, that the mind might be sanctified by His love.
—H.H. Pope Shenouda III, Before the Just Judge