Musar su Salmi 55:78

And this is the thing about the group of liars - the content of this group is divided into nine sections:
The first section: The lying man that left the Torah and does evil and destroys with the response of his mouth - like one who contradicts his countryman about a deposit or a transfer or the wage of a wage-worker, as it is stated (Leviticus 19:11), “you shall not deal deceitfully or falsely, a man towards his countryman.” And likewise, one who bears false witness against his neighbor; and it is said (Exodus 20:13), “you shall not bear false witness against your neighbor.” And included in this section is deception and fraud in commerce and in partnerships; and it is stated (Leviticus 25:14), “you shall not cheat, one man, his brother.” And it is [also] stated (Psalms 55:12), “fraud and deceit never leave its square.” And he is called a man of iniquity and a ruffian; and he is the heaviest with iniquity from the groups of the evildoers, as we have discussed in the Gates of Fear of Sin (no longer extant). And the characteristics of this man of iniquity are that he winks his eyes and rolls his fingers, as it is written (Proverbs 6:12-13), “A ruffian individual, a man of iniquity, etc. Winking his eyes, etc.”

The wise man said : Every man needs a fence and support in order that his good deeds should be brought to fulfillment. And what is the fence? It is complete trust — to always trust in God, may He be Blessed, as it is said : "Cast your burden upon the Lord and He will sustain you" (Ps. 55:23).

More important than everything else is solitude. For when he removes worldly matters from before his eyes, so too he removes lust for them from his heart. King David, peace be unto him, praised solitude saying: "Oh, that I had wings like a dove! I would fly away and be at rest; yes, I would wander far away; I would lodge in the wilderness forever" (Tehilim 55:7-8). And we find that the prophets Eliyahu and Elisha would set their dwelling place in the mountains due to their practice of solitude. And the early pious sages, of blessed memory, followed in their footsteps. For they found solitude to be the best path to acquire perfection in Separation, so that the vanities of their neighbors would not lead them to also become vain like them.

However, you must know that just like Purity of thought applies to the bodily deeds which are intrinsically near to the evil inclination, whereby Purity involves distancing the bodily deeds from the evil inclination such that they don't stem from it, so too Purity of thought applies to the good deeds which are near to the Creator, blessed be He, whereby, Purity involves not distancing from G-d and not stemming from the evil inclination. This is the matter of "not for the sake of the mitzva itself" (Shelo Lishma), mentioned frequently in the words of our sages, of blessed memory.

The Kabbalists warn that one must not travel alone without contemplating thoughts of Torah or fear of Heaven lest the Sitrah Acharah cling to him. The Zohar states clearly (Parashas Vayishlach 169b) that even in town if a person is out alone at an hour that people are not usually found on the street the Sitrah Acharah will cling to him and he will not escape without committing some iniquity that very day. Therefore he must conduct himself in the following manner: If he plans on going out alone to tend to his affairs very early or very late in the day when few people are around, let him recite in front of the mezuzah the verse, “Cast your burden upon Hashem and He will provide for you” (Tehillim 55:23). And when he comes to the Divine name let him envision it with the vowels of the word yehavcha (“He will provide for you”), that is, with a sheva beneath the yud, a kamatz beneath the first hei, a sheva beneath the vav and a kamatz beneath the second hei. Since a sheva resembles two yudim, one on top of the other, and a kamatz resembles a reclining vav with a yud beneath it, the numerical value of this vocalization is equal to six yudim and two vavim, or seventy-two. This is the same as the numerical value of the word chessed — “lovingkindness.”