To knowingly split an infinitive or not to?

And what about ending a sentence with preposition, or for that matter beginning one with 'and'?

We learn language by instinct, but good English, the pedants tell us, requires rules. Yet, as Oliver Kamm demonstrates, many of the purists' prohibitions are bogus and can be cheerfully disregarded. ACCIDENCE WILL HAPPEN is an authoritative and deeply reassuring guide to grammar, style and the linguistic conundrums we all face.