The nineteenth principle is leaving the sin when it chances upon him and he is still at the height of his desire. And our Rabbis, may their memory be blessed, said (Yoma 86b), "Who is the penitent whose repentance reaches the Throne of Glory? When he is tested and comes out clean at the same time in the same place and with the same woman." [This is] meaning to say, when the sin avails itself to him, he is at the height of his impulse and his might is in the muscles of his belly like the first moment when he sinned; but he conquered his impulse and escaped from the iniquity due to his fear of God and the greatness of his fright. But for the one to whom it has not availed itself in this manner, he should augment his fear of God on a daily basis all of his days. And when he has reinvigorated the strength of his fear enough to conquer his impulse with this strength and his power over the power of the desire - does not the Examiner of hearts understand and the Fashioner of his soul know that if a test would come to him and it be like the first [situation], that he would save himself from his impulse? So behold that in front of God he is on the highest level of repentance...

The second principle is leaving the sin: That he should leave his evil ways and decide with all of his heart that he will not continue to return this way again. And if he did evil, he shall not do [it any] more, like the matter that is stated, (Ezekiel 33:11), "Return, return from your evil ways"; and [likewise] stated (Isaiah 55:17), "Let the wicked give up his ways." But know that [in the case of] one who sins by happenstance because he had a desire and his impulse overpowered him and attacked him, whereas his ideas and senses did not rescue him when he encountered it; so they were not quick to rebuke him in the sea of desire, to dry it up - hence the impulse dragged him into its nets and he fell into its snares at that particular time and instant, at the time that the spirit of the evil impulse kicked him down, but not because of his [own] desire and will to find his iniquity and to do like this afterwards: The beginning of the repentance of this man is regret; to place sorrow into his heart about his sin, to have his soul be afflicted and bitter like wormwood. Afterwards, he should increase the fear of sin in his heart every day, and put the dread of God into his heart at all times, until his heart becomes steady in the trust of God. As if the impulse comes across him again - like it does from time to time - and his desire become fanned like the first case, his heart will not be seduced by it and he will abandon its path. [This is] as it is stated (Proverbs 28:13), "but one who confesses and abandons [them] will find mercy" - it mentions "confesses" first, about the regret and the confession; and afterwards, "abandons." However [in the case of] one who is constantly positioned on the path that is not good, ...For such a man, the beginning of his repentance is to abandon his evil way and thoughts, and to agree, resolve and accept upon himself to not continue sinning. Afterwards, he should regret and return to God, as it is stated (Isaiah 55:7), "Let the wicked give up his ways, the sinful man his plans; let him turn back to the Lord, and He will pardon him." And the parable for this is about one who holds a sherets (an impure crawling animal) and comes to immerse and become pure. For he must first leave the sherets, and then immerse and become purified. But all the time that the sherets is in his hand, his impurity is still with him and the immersion is ineffective...