The only letters that can wait are those which provoke a hot answer.  

He has achieved success who has lived well, laughed often, and loved much, who has gained the respect of intelligent men and the love of little children;

Carlyle pointed out that crabbedness, pride, obstinacy, and affectation are, at bottom, want of strength – weakness.

Who are we, what is our insight into other men’s hearts, that we should foreclose the time of their growth;  that we should call for speed, when God, it may be, is patiently disengaging their minds from difficulties that we have never known;