Cheerfulness is the very flower of health.

Nothing is more beautiful than cheerfulness in an old face

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

He makes a July's day short as December, And with his varying childness cures in me Thoughts that would thick my blood.

Had she been light, like you, Of such a merry, nimble, stirring spirit, She might ha' been a grandam ere she died; And so may you, for a light heart lives long.

That load becomes light which is cheerfully borne. [Lat., Leve fit quod bene fertur onus.]