Faith is a sort of vague, hopeful idealism. I have faith that your check won’t bounce. I don’t know, but I hope. Knowledge is far more concrete. I know that fire burns and that heavy objects fall. And while both faith and knowledge seem commendable, when it comes to relating to HASHEM, both fall short of what a human is capable of.
We have the capacity to experience HASHEM. Not only to have faith that He is present, not only to know it with absolute certainty, but to actually experience HASHEM. To reach that level, we must learn to encounter HASHEM.