Happiness

is a choice that requires effort at times - Aeschylus.

Aeschylus was an ancient Greek playwright. He is also recognized as the "father of tragedy".

I would modify his quote to be "Happiness is a choice that requires effort most of the times". Very rarely will it seem to happen totally out-of-the-blue. But even on those rare occasions, if you dig deeply, you will find that too was the fruit of some effort on your part at some point in time. It might have been a while back, it might have been seemingly effortless - but nonetheless some effort at some point went into it.

- manzoor