All the great evils which men cause to each other because of certain intentions, desires, opinions, or religious principles, are likewise due to non-existence, because they originate in ignorance, which is absence of wisdom.

Risk comes from not knowing what

Risks are known unknowns. Uncertainties are unknown unknowns.

Ignorance, the root and stem of every evil.

Economics is a very dangerous science.

Ignorance, the root and stem of all evil.

True, as unwisdom is the worst of ills

The evil that is in the world almost always comes from ignorance, and good intentions may do as much harm as malevolence if they lack understanding.

It is what you do not know that is your greatest risk.

The evil in the world comes almost always from ignorance, and goodwill can cause as much damage as ill-will if it is not enlightened. People are more often good than bad, though in fact that is not the question. But they are more or less ignorant and this is what one calls vice or virtue, the most appalling vice being the ignorance that thinks it knows everything and which consequently authorizes itself to kill. The murderer's soul is blind, and there is no true goodness or fine love without the greatest possible degree of clear-sightedness.

At the root of all the harm we cause is ignorance.

The greater the uncertainties of the world, the greater is the possibility that profits would go to venturesome and lucky rather than to logical, careful, fact-gathering individuals.

Of all human ills, greatest is fortune's wayward tyranny.

The greatest of evils and the worst of crimes is poverty.