Did James Joyce really coin "If you want to know what a man thinks watch what he does"?

Factual Questions
1

Hi
Did James Joyce coin “If you want to know what a man thinks watch what he does”? I couldn’t find it. If not Joyce, who?

I look forward to your feedback.

  1. 28 minutes into to video.

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2

I can’t find any attribution for the quote. It is not listed in Brainy Quotes under Joyce, so probably not his.

I have seen it referred to as “an old Irish saying.”