“Life can only be understood backwards; but it must be lived forwards.”
“Anxiety is the dizziness of freedom.”
“People demand freedom of speech as a compensation for the freedom of thought which they seldom use.”
“The most common form of despair is not being who you are.”
Or, try one other quote from Friedrich Nietzsche. Here it is:
“Battle not with monsters, lest ye become a monster, and if you gaze into the abyss, the abyss gazes also into you.”