People are where they are because that is exactly where they really want to be whether they will admit that or not.
Take a method and try it. If it fails, admit it frankly, and try another. But by all means, try something.
It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something.
We are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances.
I must admit that I personally measure success in terms of the contributions an individual makes to her or his fellow human beings.