I suppose it is tempting, if the only tool you have is a hammer, to treat everything as if it were a nail. - Abraham Maslow

If the only tool you have is a hammer, you tend to see every problem as a nail.

It looks as if there were a single ultimate goal for mankind, a far goal toward which all persons strive. This is called variously by different authors self-actualization, self-realization, integration, psychological health, individuation, autonomy, creativity, productivity, but they all agree that this amounts to realizing the potentialities of the person, that is to say, becoming fully human, everything that person can be.

"In a word if you tell me you have a personality problem I am not certain until I know you better whether to say "Good!" or "I'm sorry." It depends on the reasons. And these, it seems, may be good reasons, or they may be good reasons."

Certainly a visitor from Mars descending upon a colony of birth-injured cripples, dwarfs and hunchbacks...could not deduce what they should have been. But then let us not study cripples, but the closest thing we can get to whole, healthy men. In them, we find qualitative differences, a different system of motivation, emotion, value, thinking and perceiving. In a certain sense, only the saints are mankind. All the rest are cripples.