Laughter is wine for the soul - laughter soft, or loud and deep, tinged through with seriousness - the hilarious declaration made by man that life is worth living.
A laugh is the loud echo of a sigh; a sigh the faint echo of a laugh.
Laughter tends to mock the pompous and the pretentious; all man's boastful gadding about, all his pretty pomps, his hoary customs, his wornout creeds, changing the glitter of them into the dullest hue of lead.