"I believe that God ... has given me ... my reason, and all my senses, and still preserves them."

I memorized that dutifully as a young teenage catechumen. Yet with respect to what God "preserves," the normal course of human life is such that in time our faculties are diminished or lost through illness, injury or age. To acknowledge that is by no means to blame God, but rather points to the kind of mature understanding expressed by Job:

"The LORD gave, and the LORD has taken away; blessed be the name of the LORD" (Job 1:21 ESV)