Cheerfulness smooths the road of life.

My religion of life is always to be cheerful.

The highest wisdom and the highest genius have been invariably accompanied with cheerfulness. We have sufficient proofs on record that Shakespeare and Socrates were the most festive companions.

While there is a chance of the world getting through its troubles, I hold that a reasonable man has to behave as though he were sure of it. If at the end your cheerfulness is not justified, at any rate you will have been cheerful.

A merry heart maketh a cheerful countenance.

...he that is of a merry heart hath a continual feast.

A merry heart doeth good like a medicine ...

Oh, give us the man who sings at his work.

You find yourself refreshed by the presence of cheerful people. Why not make an honest effort to confer that pleasure on others?

My religion of life is always to be cheerful.