It’s the universal force that makes it possible for things to be improved.
If there were no doubt, it would be necessary to invent it. Doubt is a light in the darkness, a sword against ignorance and a support to the intellect. Doubt is the fount of wisdom because doubt leads to knowledge and knowledge to wisdom.
There are three axes to the universe of intellect, the known, the unknown and the unknowable; doubt is the compass that makes these distinguishable.
Doubt begets Curiosity which becomes Discovery, the parent of Knowledge that matures into Wisdom that fosters Righteousness. Doubt makes it possible, necessary and desirable to discern Truth from Error.
Doubt is a feast of learning that satisfies with hunger for more knowledge.
Doubt is the creed of scurrying life, the Code of Rikki Tikki Tavi: Go and Find Out.
Doubt is the essential trait of intelligence; does a cockroach have doubt? How would we test that? If it does, what would that prove? If it doesn’t, why does it bother to scurry?