But words are things, and a small drop of ink,
Falling like dew, upon a thought, produces
That which makes thousands, perhaps millions, think;
'Tis strange, the shortest letter which man uses
Instead of speech, may form a lasting link
Of ages; to what straits old Time reduces
Frail man, when paper - even a rag like this - ,
Survives himself, his tomb, and all that's his.
Lord Byron - from Don Juan

The difference between practice and theory is often greater in practice than it is in theory.