Jer 17:9 'The heart is deceitful above all things and desperately wicked, who can know it'.
Mk 7:21-23 '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'.
James 3:6-8 'And the tongue is a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course of nature; and it is set on fire of hell. For every kind of beasts, and of birds, and of serpents, and of things in the sea, is tamed, and hath been tamed of mankind: But the tongue can no man tame; it is an unruly evil, full of deadly poison'.
To live in sinless perfection in this life you have to have a perfect heart and a perfect tongue because out of the abundance of heart the mouth speaks (Mt 12:34). You also can't have any vain thoughts or imaginations of the heart that might be evil.
Mt 5:28 'But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart'.
This next verse is a real killer to those that believe in this silly notion of sinless perfection in this life, whether within the context or without.
Rom 14:23 'And he that doubteth is ****ed if he eat, because he eateth not of faith: for whatsoever is not of faith is sin'.
Do you think that Enoch walked in sinless perfection and God took him so that he did not die (Gen 5:24, Heb 11:5)? Was he not born as the seventh from Adam after the fall? Outside of Christ he is one of two men you could point to (outside of Christ) that could have lived in sinless perfection because they never died. There is nothing else written about Enoch except that he had a testimony that pleased God or in the book of Enoch. All other men died because of the wages of sin except Elijah who was also taken up into heaven (2Kgs 2:11). At what point would these men be living in sinless perfection so that it would be impossible for them to sin again. These two men had inherited from Adam an old sin nature giving them the potential to sin at any time. Jesus was the only one and the only man that was born who did not inherit sin from Adam. He is the sinless one who died as a perfect man without knowing sin or iniquity.