Laughter means sympathy; good laughter is not "the crackling of thorns under the pot."
 Thomas Carlyle, On Heroes, Hero-Worship, and The Heroic in History (1841). copy citation

Context

“Not at mere weakness, at misery or poverty; never. No man who can laugh, what we call laughing, will laugh at these things. It is some poor character only desiring to laugh, and have the credit of wit, that does so. Laughter means sympathy; good laughter is not "the crackling of thorns under the pot." Even at stupidity and pretension this Shakspeare does not laugh otherwise than genially. Dogberry and Verges tickle our very hearts; and we dismiss them covered with explosions of laughter: but we like the poor fellows only the better for our laughing;” source