Sexual performance problems, such as impotence and frigidity, are 70 to 90 percent changeable. But a homosexual who wants to be a heterosexual - that's close to unchangeable. And a transsexual - say a man who believes he's really a woman in a man's body - is completely unchangeable; you'd have to change the body to conform to the psyche.

Creativity is bound up in our ability to find new ways around old problems.

I've been bothered about time generally and our tripartite division of time into past, present, and future. I think I know what the past is, and I think I know what future is, but I'm really not comfortable with the notion of present.

Martin Seligman Quotes