Havamal

Moderately wise should each one be, but never over-wise; for a wise man’s heart is seldom glad, if he is all-wise who owns it.

Meðalsnotr skyli manna hverr æva til snotr sé því at snotrs manns hjarta verðr sjaldan glatt, ef sá er alsnotr er á

Havamal: 55, Gestaþáttr