Who said "I only know that morality is not a thing to be debated."?

This quote is attributed to Basil Hallward.

I only know that morality is not a thing to be debated. - Basil Hallward

"I only know that morality is not a thing to be debated."

Basil Hallward

Character in The Picture of Dorian Gray

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"Sin is a thing that writes itself across a man's face."

"I hope I shall grow old gracefully."

"Dorian, from the moment I met you, your personality had the most extraordinary influence over me."

"To make oneself perfect is the aim of us all."