Do not hide unwanted things in the fog

Some quotes from Jordan Peterson's Beyond Order.

Failing to look under the bed when you strongly suspect a monster is lurking there is not an advisable strategy.

When ignorance is bliss, after all, 'tis folly to be wise.

Someone with experience knows that people are capable of deception and willing to deceive. That knowledge brings with it an arguable justified pessimism about human nature, personal and otherwise, but it also opens the door to another kind of faith in humanity: one based on courage, rather than naivete. I will trust you—I will extend my hand to you—despite the risk of betrayal, because it is possible, through trust, to bring out the best in you, and perhaps in me.

At first I misunderstood this one: When ignorance is bliss, after all, 'tis folly to be wise.

I thought folly meant something desired. And thus assumed it was meant to support the argument of the chapter, as a contradiction to the original quote. But it IS the original quote.

When lack of knowledge brings happiness, it is unwise to seek knowledge, it may lead to unhappiness or complications.

The point Peterson is trying to make with this rule is however complicated it might be to seek that knowledge, it is much prefered in the long run than to remain ignorat.