Somewhere between these two
lies something like wisdom:

Adapting itself to obstacles and bending around them, wood in the earth grows upward without haste and without rest. Thus too the superior man is devoted in character and never pauses in his progress.

(I Ching, Hexagram 46 Shêng, Pushing Upward, Late 9th Century BC)

Doubt.
Doubt thyself.
Doubt even if thou doubtest thyself.
Doubt all.
Doubt even if thou doubtest all.

(Aleister Crowley, The Book of Lies, 1912)