A small but growing list, in no particular order:

In the fields of observation chance favors only the prepared mind. -Louis Pasteur

Make hay while the sun shines.

From Ani DiFranco:  ”You can’t really place blame, because blame is much too messy. Some was bound to get on you while you were trying to put it on me.”

From Michael Pollan:  ”Don’t eat anything your great grandmother wouldn’t recognize as food.”

Don’t be a jerk.

Everything in moderation.  Including Moderation.

Measure twice, cut once.

From Jamie Gilson:  ”In relationships, always assume that the other person is being reasonable.”

One of George Washington’s etiquette lessons: Labour to keep alive in your Breast that Little Spark of Celestial fire Called Conscience.

From an Elizabeth Pitman needlework from Rhode Island, as seen on Antiques Roadshow:  ”May spotless innocence and Truth my evry action guide and guard my inexperienced youth from arrogance and pride.”

Wedding day advice Norman Karr gave to his son:  ”Don’t fight to win. Discuss to resolve.