Learn young, learn fair; learn auld, learn mair.
Learn your gudewife to mak milk kail.
That is, "Teach your grandmother to suck eggs."
Learn you an ill habit and ye'll ca't a custom.
Least said soonest mended.
Leave aff while the play's gude.
Leave a jest when it pleases you best.
Leave the court ere the court leave you.
Leave welcome aye behint you.
Prolong your stay only so long as you find your company approved of, so that you may not be considered tedious.