Who said "Conscience is the light by which we see all else."?

This quote is attributed to Seamus Heaney.

Conscience is the light by which we see all else. - Seamus Heaney

"Conscience is the light by which we see all else."

Seamus Heaney

Poet Irish 1939–2013

"Between my finger and my thumb the squat pen rests; snug as a gun."

"Whatever is given can be taken away."

"The main thing is to get the mood right."

"Happiness, I have discovered, is nearly always a rebound from hard work."