Here it is

We are now touching a realm in which any falsely-directed attempt to gain too precise a knowledge is bound to end in disastrous foolishness; a realm in which only the humble admission of ignorance can be true knowledge and only wondering attendance before the incomprehensible mystery can be the right confession of faith in God. Love is always mysterium - more than one can reckon or grasp by subsequent reckoning. Love itself -the uncreated, eternal God - must therefore be in the highest degree a mystery, the mysterium itself>

-Joseph Ratzinger, Introduction to Christianity, 114. Quoted in Aidan Nichols, The Thought of Pope Benedict XVI.

I think the part about "too precise a knowledge" has some relevance to politics: at the root of authoritarianism and cancel culture is the idea that the "experts" have the knowledge and so we have to let them run things.