Friedrich Nietzsche said:
“Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you.”
Nietzsche created his own monsters and struggled with his own demons. However, sometimes I feel that Nietzsche himself gazed too long into Christianity (his abyss). And Christianity gazed back into him. His writings contain valuable insights that agree with true Christianity despite the fact that he hated it and despised Jesus.
For example, when he said:
“And those who were seen dancing were thought to be insane by those who could not hear the music.”
He nailed it. You deaf don’t mock dancers. This is very similar to what Jesus said (in fuller form):
“Judge not, that you be not judged. For with the judgment you pronounce you will be judged, and with the measure you use it will be measured to you. Why do you see the speck that is in your brother’s eye, but do not notice the log that is in your own eye?“