fool's paradise

At others, I yield to a fools paradise and delude myself with impossible solutions that deceive me but for an hour.

It saves us from building castles in the air or living in a fools paradise.

Let it be so; a fools paradise, but still for me a paradise.

She would have given you a brief fools paradise, said that devil.

His under-current of common sense told him that he had again entered a fools paradise.