happiness is a state of the mind

"For every ailment under the sun,
There is a remedy, or there is none;
If there be one, try to find it,
If there be none, never mind it."

That are three kinds of craving forces in our minds. These are: - craving for existence, craving for wordly or sensual indulgence, and craving for non-existence. These three cravings are responsible for our existence, our rebirth, and all the thousands of other problems and mental disturbances.

Arthur Schopenhauer explained these three forces as sexuality, self-preservation and suicide. Sigmund Freud explained thesse same things as libido, ego instinct and death instinct.

"From the sources of instinct spring forth everything creative." (Carl Jung)