To keep the mouth shut is the best lesson in dental care..

If a fact is too obvious, we need not discuss it at all..

Discussion often generates doubts and uncertainties even on issues which are obvious.

 Discussion often tends to encourage people to compare data, distort data, and ends up in argument.. 

and when we start arguing we take up the spirit of argument and most often forget the subject altogether.. (and this fact is well known to lawyers)

Not to contradict is diplomacy.. 

In an argument usually we lose and we lost some friends too.. 

At least we can retain friends by not arguing..

To keep the mouth shut is the best lesson in dental care..

When we make a point, we start to look for anyone who opposes it, and our dislike increases when our critic is right in taking an opposite view and we know he is right..

Keeping quiet is nice business.

And going on telling "Jai ho" "yes, Sir" is the most profitable trade for anyone.. One can earn profit there without any capital or investment.