What is a word for a "phrase to remember", e.g. "Life is like a box of chocolates"? [duplicate]

Solution 1:

The saying is categorised as a proverb on Literary Terms:

In the movie Forrest Gump, the main character frequently speaks in proverbs, and is even shown inventing a few. For example:

Life is like a box of chocolates. You never know what you’re gonna get.

This proverb means that life is full of surprises and it is impossible to predict the future.

According to CED, a proverb is

a short sentence, etc., usually known by many people, stating something commonly experienced or giving advice

Solution 2:

I think what might fit best here is aphorism, meaning

A pithy observation that contains a general truth, such as, “if it ain't broke, don't fix it.”