DEUT30 Shlomo, a"h, also said (Mishlei 16:28), "a malcontent alienates a friend." [Rabbeinu Yonah understands "aloof" as "friend"; See Tehillim 14:14, with last explanation by Rashi]. This means that he alienates a beloved one and a friend, for they are not capable of enduring his company. Our Sages said (Derech Eretz Zutah 9), "Do not be overly critical lest you come to sin." Many times a malcontent is ungrateful [for the good he receives], and may even view it as bad, repaying evil for good – – and the pasuk says [Mishlei 17:13), "one who repays good with evil, evil will not depart from his house." Sometimes he regards the kindnesses of Hashem as revenge and retribution as the pasuk says [this verse], "You grumbled in your tents and said, 'Out of Hashem's hatred for us, He took us out.'" Therefore, distance yourself from the road of malcontents for they have warped their paths; all who walk in them do not know peace. [Yeshayahu 59:8]. Train your tongue to give [others] the benefit of the doubt, and let righteousness gird your loins. [Yeshayahu 11:5].