Musar su Salmi 37:3

We shall explain the trait of bitachon a little before returning to our subject. David, may peace be upon him, said (Psalms 37:3): "Trust in the L-rd and do good, dwell in the land and cultivate faith." First he exhorts man in the trait of bitachon ("Trust in the L-rd") and then in the doing of good. For it [bitachon] is a strong foundation on which the entire edifice can be built. For example, our holy Torah commanded us to be heedful of Torah study at all times — at least, of the setting of assigned times for Torah study, and, likewise, with the giving of charity, and with other mitzvoth — which, on the surface, would seem to bode a loss for one's possessions. And the yetzer hara incites him to think: "What will I do in 'my latter end,' if I do not exert myself more for my business, especially at this time, which is especially auspicious for going here and there, and 'if not now, then when?'" It attempts to divert him by such devices from his assigned Torah times and, also, from the giving of charity. Scripture, therefore, comes to exhort us: "Trust in the L-rd!" For He will certainly recompense you with all that is due you; "and do good" — As a result of this, you will be able to do good. As stated in Yerushalmi, Sotah 9: "One was learning and the [potential] buyers called for him to come out and do business with him, and he said: 'I cannot interrupt my study time; if it [my livelihood] has to come, it will come,'" of itself, from the Holy One Blessed be He, even after I have completed my assigned study time.

On this scripture says: "trust in G-d and do good dwell in the land and be nourished by faith" (Tehilim 37:3).

But the man who was completely purified from this affliction and has been cleansed of all trace of evil which lust leaves behind it, behold his vision will be perfectly clear and his discernment will be pure. He will not be swayed by any desire. He will recognize anything which is a sin. Even for the most minuscule, he will see its evil and will distance from it. On this our Sages referred regarding the men of Sheleimut (Wholeness) who purified their deeds to such a great extent as to leave not even a stirring of evil - "the clean minded men of Jerusalem" (Sanhedrin 23a).