How important is faith to the human psyche?

There is a great line from a movie titled “Secondhand Lions” from a larger than life character giving his “What every boy needs to know to become a man” speech. This particular segment of the speech touches on faith and goes something like (paraphrased):

If you want to believe in something, believe in it. It doesn’t matter if it is true or not, what matters is that you have something to believe in. Sometimes the things that people need to believe in most are not necessairly true, things like good always triumphs over evil, love conquers all, etc… It doesn’t matter if they are true or not, what matters is that you have something to believe in.

So, what do y’all think. How important is faith?