Is ignorance bliss?

The lyrics, "The more I see, the less I know" by the Red Hot Chili Peppers, is a perfect example for my view on ignorance being bliss. Sometimes when I find out something new, I use the Coherence theory and take previous knowledge to question whether or not I agree with this new idea, or even believe it is true. But how can I ever fully be sure if even my previous knowledge is real? It's not that I don't enjoy learning new things and piecing things together, but on certain occasions I would rather be ignorant. The Coherence theory involves questioning truth because it requires each statement to be backed up by another statement, therefore it can lead you to question everything and not believe things that you need to know. The Correspondence theory lets you trust things simply by saying that it corresponds with the way the world is. So which theory allows you to know more?