I actually had this as an informal rule at one place I worked and the junior developer improved dramatically. My best moment as a mentor came when he turned to me and said "Why aren't we using XYZ module?" When I asked him where he'd heard of XYZ, he said "Oh, I read a post on PerlMonks by so-and-so who seems to know what he's talking about." My heart almost burst with pride!
Being right, does not endow the right to be rude; politeness costs nothing.
Being unknowing, is not the same as being stupid.
Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.
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