I am unable to find what I wanted to about Bion and thinking but I found something else
from which I copied a quote
It is too often forgotten that the gift of speech, so centrally employed, has been elaborated as much
for the purpose of concealing thought by dissimulation and lying as for the purpose of elucidating
and communicating thought. – Wilfred Bion
How my heart sings 
He seems worth reading though he is hard to follow