I don't know the late Mr. Conquest's writings, but this bit of his verse made me laugh.
“Those teach who can’t do” runs the dictum,
But for some even that’s out of reach:
They can’t even teach—so they’ve picked ’em
To teach other people to teach.
Then alas for the next generation,
For the pots fairly crackle with thorn.
Where psychology meets education
A terrible bullshit is born.