It is more fitting for a man to laugh at life than to lament over it.
— Marcus Annaeus Seneca Seneca The Elder

I have found life an enjoyable, enchanting, active, and sometime terrifying experience, and I've enjoyed it completely. A lament in one ear, maybe, but always a song in the other.
Sean O'Casey lament quote

Then indecision brings its own delays, And days are lost lamenting o'er lost days. Are you in earnest? Seize this very minute; What you can do, or dream you can, begin it.
— Johann Wolfgang von Goethe

Happiness is the only sanction of life; where happiness fails, existence remains a mad and lamentable experiment.
— George Santayana

It is lamentable, that to be a good patriot one must become the enemy of the rest of mankind.
— lament quotation by Voltaire