What is a quote that teaches the following:?

Question

I need a quote which teaches that while trying to achieve a goal you should not sacrifice everything that makes you yourself. It is to describe a morale in "Brave New World" (it can be on the scale of a whole society like in the book or at an individual level)

Answer 1

The Bible says it best.

What profiteth a man if he gain the

whole world, and lose his own

soul?

Matthew Chapter 16 Verse 26

Answer 2

to thine own self be true

Answer 3

Frederich Neitzsche stated

"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you."

Answer 4

It is better to die on your feet than to live on your knees.