It states in the Sefer Ha’Ikrim, “Bitachon in Hashem is greater than all praises that one can say to Hashem.”
We can say all day that Hashem is the Master of the World, He can do everything, He loves us, He helps us, etc., but perhaps our hearts do not accept what we are saying. Perhaps we have some doubts.
But when one has bitachon, it proves that he believes that Hashem loves him, cares for him, and will help those who rely on Him. Bitachon is the greatest praise because he is living and practicing what he believes in.