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Doubt must be no more than vigilance, otherwise it can become dangerous.

I am always cautious.

I'm very wary of trust, you see.

I guess you could say I'm pretty wary.

I am sufficiently wary of dangerous situations, but I'm not scared of having a go.

Doubt is not a pleasant condition, but certainty is absurd.

Without sounding overly pompous about it, I don't really trust certainty in anything, actually. Especially as I get older. Except love. I'm certain of love, I guess.

We necessarily operate in an environment in which there's a great deal of uncertainty. In such an environment, it makes sense to use a risk-management approach to identify and avoid the big mistakes. That's one reason I favor a cautious approach.

When you doubt, abstain.

Better to trust the man who is frequently in error than the one who is never in doubt.