What are the tritest yet probably kind of profound expressions you know? I was just thinking of
"Don't cry because it's over, smile because it happened"
(Attributed sometimes to Dr. Seuss but that is suspect.) The version Marvel cribbed from Seneca the Younger "Every journey has an end" sounds a little less corny.
And I'd put the Serenity Prayer ("God grant me the serenity to accept the things I cannot change, courage to change the things I can, and the wisdom to know the difference") there too.
I think all of these - hokey as they might be - get to one of the two central points of Buddhism, acceptance and non-attachment.
Its been pointed out to be that I focus a bit too much on that point, and maybe not enough on the other point of compassion. I guess one too well-worn phrase for that is "be kind, for everyone you meet is fighting a hard battle".
All those AA/12-step slogans that people put on bumper stickers--"Easy Does It", "One Day At A Time".
If there's wet dreams then there's probably wet nightmares