Ramina Grobis has conveniently put some classic reflections together here.

Sophocles:

"Not to be born surpasses all value;
To go back whence we come, as fast as possible,
Is second by far.
When the young creature is born
In ignorance, what blow full of grief is not to be expected?
Who is not caught up into pain?"

Ecclesiastes:

"Wherefore I praised the dead which are already dead more than the living which are yet alive. Yea, better is he than both they, which hath not yet been, who hath not seen the evil work that is done under the sun."

Silenus:

"Suffering creature, born for a day, child of accident and toil, why are you forcing me to say what is the most unpleasant thing for you to hear? The very best thing for you is totally unreachable: not to have been born, not to exist, to be nothing. The second best thing for you, however, is this: to die soon."

But since we're already along for the ride, Epicurus still has the best attitude: a piece of bread, some goat cheese and good friends all carry the day at a modest cost.