Friedrich Nietzsche probably gets more pseudo-intellectual airtime than any other philosopher with his deeply insightful aphorisms, the most famous of which are:

Love is blind.

That which does not kill us makes us stronger.

He who fights with monsters might take care lest he thereby become a monster.

If you gaze for long into an abyss, the abyss gazes also into you.

What does your conscience say?

You should become the person you are.

In every man a child is hidden that wants to play.

And: God is dead.

As entertaining and ubiquitous those sayings are, Nietzsche's genius for comprehension also produced less commercial but more useful understandings:

There are no facts, only interpretations.

I’m not upset that you lied to me, I’m upset that from now on I can’t believe you.

It is hard enough to remember my opinions, without also remembering my reasons for them.

In heaven, all the interesting people are missing.

And my personal favorite is:

The higher we soar, the smaller we appear to those who cannot fly.