Ask Him to reveal your thoughts and intents to you. Face it honestly. Train up your mind to think according to the scriptures as you grow up in God. But when you grow up to be a man to the stature of Christ think as Christ. Let the mind of Christ be in you.
Love thinks no evil.
Keep God in all your thoughts. I remember how when I was a student the moment I felt left home for college, God would slip out of my mind. Once back home, suddenly I would remember Him. I tried hard to keep God in my thoughts throughout the day. So in every note and book I had a Bible verse written to switch my mind back to God.