In Aquinas's thought, the goal of human existence is union and eternal fellowship with God. Specifically, this goal
is achieved through the beatific vision, an event in which a person experiences perfect, unending happiness by
seeing the very essence of God. In ontology you can give a definition for some concept because it "is" what it "is".
Gravity is defined in this way, since physics does not explain where gravity comes from it just describes how it
works, and what laws this phenomenon "seems" to follow.
You can give an epistemology definition to some concept via formula's, for example like the way Newton introduced
the concept of force as F = Mass * Acceleration. This definition is backed up by experimental evidence, so that
the definition is "proven".
In ontology credence is given to things based upon the fact that they "are" what they seem to be. This definition
does not explain why this thing is what it is. In epistemology you give definitions based upon some logic proof
like the diverse laws in physics
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