From the Dhammapada (short sayings of the Buddha):

50. Let none find fault with others; let none see the

      omissions and commissions of others. But let one

      see one’s own acts, done and undone.

61. Should a seeker not find a companion who is better

      or equal, let him resolutely pursue a solitary

      course; there is no fellowship with the fool.

64. Though all his life a fool associates with a wise

      man, he no more comprehends the Truth than a

      spoon tastes the flavor of the soup.

67. Ill done is that action of doing which one repents

      later, and the fruit of which one, weeping, reaps

     with tears.

81. As a single slab of rock won’t budge in the wind, 

      so the wise are not moved by praise, by blame.

83. Everywhere, truly, those of integrity stand apart. 

      They, the good, don’t chatter in hopes of favor or gains. 

      When touched now by pleasure, now pain, 

      the wise give no sign of high or low.