Musar su Salmi 26:5

The seventeenth thing to remember is that it is a very good quality to keep away from people when he can save himself from them, and sit in his room alone. For most transgressions are committed by two or more — for example, fornication, gossip, lies and flattery — and from all of these he who sits alone is saved for he will not vaunt himself over any man and he will not hear their idle talk. For when he stays with them he is obliged to rebuke them in three ways : either by striking the offender, as Phinehas did when he took the javelin in his hand (Num. 25:7); or with words, as Moses our Teacher did, when he said to the wicked man, "Wherefore smitest thou thy fellow?" (Ex. 2:13); or in one's heart, as David said, "I hate the gathering of evil-doers, and will not sit with the wicked" (Ps. 26:5). And who can constantly keep quarreling with such people, inasmuch as they constantly transgress? But when you sit alone you avoid all this guilt and you are saved from many transgressions. But pious people one should join and one should sit near them and learn from them, as it is written, "He that walketh with wise men shall be wise" (Prov. 13:20).