Q105. Is my heart then the fountain and original of sin?
Yes; For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness. All these evil things come from within, and defile the man.
Scripture Proofs — King James Version
1
Mark 7:21,23
“For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, All these evil things come from within, and defile the man.”