errors

People are just like computer programs -- they seem well-designed at first, but once there is an error they either don't tell about it, or they give the wrong reason for the error.

Praise and criticism

It is often better to be criticized than to be praised by people who are not sincere in their praise. Whereas the criticism is often not related to who we are and what we do, praise is, just because of the very fact it is not sincere.