Without perseverance talent is a barren bed

Men fail much oftener from want of perseverance than from want of talent

He who goes to bed hungry dreams of pancakes.

If you have talent as a screenwriter, it will out. Nothing succeeds like perseverance. Never give up. Anyway, life never turns out the way you imagine, dream or plan it to. Or hadn't you heard?

Bed is the poor man's opera

A wooden bed is better than a golden coffin.