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I made it a rule to forbear all direct contradictions to the sentiments of 
others, and all positive assertion of my own.  I even forbade myself the use 
of every word or expression in the language that imported a fixed opinion, 
such as "certainly", "undoubtedly", etc.   I adopted instead of them "I 
conceive", "I apprehend", or "I imagine" a thing to be so or so; or "so it 
appears to me at present".

When another asserted something that I thought an error, I denied myself the 
pleasure of contradicting him abruptly, and of showing him immediately some 
absurdity in his proposition.  In answering I began by observing that in 
certain cases or circumstances his opinion would be right, but in the present
case there appeared or semed to me some difference, etc.

I soon found the advantage of this change in my manner; the conversations I 
engaged in went on more pleasantly.  The modest way in which I proposed my 
opinions procured them a readier reception and less contradiction.  I had 
less mortification when I was found to be in the wrong, and I more easily 
prevailed with others to give up their mistakes and join with me when I 
happened to be in the right.
-- Autobiography of Benjamin Franklin