“Do some living and get yourself a typewriter.”

His reason for not pursuing a literary career
Unsourced

Source: Bird by Bird: Some Instructions on Writing and Life

Satire IV, line 52.
The Satires

Variant: There's nothing to writing. All you do is sit down at a typewriter and open a vein.

"Lear, Tolstoy and the Fool," Polemic (March 1947)
Context: Shakespeare starts by assuming that to make yourself powerless is to invite an attack. This does not mean that everyone will turn against you (Kent and the Fool stand by Lear from first to last), but in all probability someone will. If you throw away your weapons, some less scrupulous person will pick them up. If you turn the other cheek, you will get a harder blow on it than you got on the first one. This does not always happen, but it is to be expected, and you ought not to complain if it does happen. The second blow is, so to speak, part of the act of turning the other cheek. First of all, therefore, there is the vulgar, common-sense moral drawn by the Fool: "Don't relinquish power, don't give away your lands." But there is also another moral. Shakespeare never utters it in so many words, and it does not very much matter whether he was fully aware of it. It is contained in the story, which, after all, he made up, or altered to suit his purposes. It is: "Give away your lands if you want to, but don't expect to gain happiness by doing so. Probably you won't gain happiness. If you live for others, you must live for others, and not as a roundabout way of getting an advantage for yourself."