There is no need to mention the great difference between the amount of satisfaction there is in just oneself being happy and the amount of satisfaction there is in an infinite number of people being happy.

From adversity we can learn the value of patience.

If the mind is tranquil and occupied with positive thoughts, the body will not easily fall prey to disease

If your own mental attitude is correct, even if you remain in a hostile atmosphere, you feel happy.

If humanity is to survive, happiness and inner balance are crucial. Otherwise the lives of our children and their children are more likely to be unhappy, desperate and short. Material development certainly contributes to happiness - to some extent - and a comfortable way of life. But this is not sufficient. To achieve a deeper level of happiness we cannot neglect our inner development.

If there's good, strong evidence from science that such and such is the case and this is contrary to Buddhism, then we will change.

The purpose of life is to be happy.