Doubt is useful unless you have no options

Having doubts will save you a lot of money.

Better to listen to your instincts than to heedlessly bulldoze forward.

That said, doubts can be dangerous. An army won’t follow a general that shows doubt.

Even if the general hides his doubts, he won’t be able to make decisions if he’s filled with doubt.

Sometimes doubt is just a wasted exercise. Sometimes you only have one course of action. If you have no options, ignore your doubts.

Keep moving or fail.