this phrase of Smith " ignorance is bliss"?

I think maybe he's right. The more you know about reality, the more you realize what is happening around you, the injustices, the misfortunes of other people, in other countries or close to you, the more you realize that you live surrounded by lies and liars, that everything is planned and that you can not do much to fix everything that you would like most unhappy you live. It is not that ignorance of happiness but there are things that you would live better without knowing them.

Aristotle says that happiness is found in the improvement of reason and knowledge, of knowing more every day and not being ignorant, since ignorance leads to unhappiness.