Advice may be wrong, but examples prove themselves.

Instruction is cheap and easy to give from a position you have never held. An example carries its proof inside it: the person actually did the thing, under real conditions, and you can inspect the result. That is why watching someone teaches faster than being told, and why advice from people whose own lives contradict it never quite takes. Conduct is the only argument that cannot be made hypothetically.

When you want to influence someone, do the thing instead of recommending it. When you are seeking guidance, look at what your advisers have built rather than at how well they speak.