Doesn't the word "comfortable" in this quote sum it all up?
Our beliefs about ourselves and our (physical and spiritual) environment are what make us comfortable.
Unfortunately, many of these comfortable beliefs become untenable as our true understanding of our universe increases.
As an example, 500 years ago it was firmly held that the earth was the centre of the universe despite there being no evidence for this whatsoever. But, it sure felt good to think that. Then along came Copernicus and Galileo.
Then we also took it as an unassailable truth that we humans were made in the image of God until Darwin suggested it more likely we were made in the image of monkeys.
I've reached a point where I now believe that any beliefs that make us comfortable about ourselves are probably nonsense as we are simply too emotionally involved to look at ourselves with a cold, dispassionate eye.
Unfortunately, I am forced to include in this category the concepts of a caring, loving God and free will.