Become a person who lets himself be guided primarily by warmth and humanity.
Learn to think and judge for yourself, responsibly.
Don't accept everything without criticism and as absolutely true...
The biggest mistake of my life was that I believed everything faithfully which came from the top, and I didn't dare to have the least bit of doubt about the truth of that which was presented to me.
... In all your undertakings,
don't just let your mind speak, but listen above all to the voice in your heart.