Health is the vital principle of bliss,

And exercise, of health.

James Thomson (1700-1748): The Castle of Indolence. Canto ii. Stanza 55.

'T is all men's office to speak patience

To those that wring under the load of sorrow,

But no man's virtue nor sufficiency

To be so moral when he shall endure

The like himself.

William Shakespeare (1564-1616): Much Ado about Nothing. Act v. Sc. 1.