He will be full of keen irrelevancie

Hello,

Is it possible to paraphrase the words in red?

According to my understanding, the book I am reading is talking about the psychological problems are due to the inhibition conditioned in their lives, especially their childhood. Thus, the principle of therapy is excitation, which means to let off the emotions, be spantaneous, be sincere...

It is nothing to do with intelligence, no matter how intelligent people are, they would suffer unless they practice excitation, that is to let off their emotions...

But I don't understand what "keen irreveancie" refer to.

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From Conditioned Reflex Therapy by Salter

There is one particular pattern encountered in therapy that, no matter how it disguises itself, always has only one meaning. When therapy gets intellectual it is time to be careful. Intelligent conversation that is not concerned with concrete personal situations keeps therapy at arm's length. This is true no matter how intelligent the person under treatment may be. He will never understand what we mean until he starts practicing excitation, and until then, he will be full of keen irrelevancies.