Question

Can you help me find an aphorism in "Hamlet"?

Answer 1

Here's two!

Explanation:

"Neither a borrower nor a lender be"

"To thine own self be true"

Answer 2

Here is another!

Explanation:

Dialogue of Polonius talking to Laertes before he goes off and travels to France
“Above all: to thine own self me true,
And it must follow, as the night the day,
Thou canst not then be false to any man.”