I caught this in the introduction to Desert Islands Discs on Sunday.  

Thinking is often the enemy of rhythm , you start something because an image a character a moment a scene moves almost of its own accord into rhythm. It seems to want to become a sentence.With writing thinking is often the enemy of rhythm , you start something because an image a character a moment a scene moves almost of its own accord into rhythm. It seems to want to become a sentence.

Colm Toibin goes on to describe what he needs to write: solitude, peace and silence. 

Colm Toibin goes on to describe what he needs to write: solitude, peace and silence.