I consider him of no account who esteems himself just as the popular breath may chance to raise him.
No one knows what he is doing so long as he is acting rightly; but of what is wrong one is always conscious.
Care is taken that trees do not grow into the sky.
What a man does not understand, he does not possess.
Keep not standing fixed and rooted. Briskly venture, briskly roam.
The world only goes forward because of those who oppose it.