Ment, but I don't know if such an obvious clue can exist, or I'm just forcing it.
He has a quote from Kant in his signature.
And in Kant's wiki, I found this:
In a letter to K. F. Stödl on May 4, 1793, Kant spoke about the goals of his work: "The long-planned plan regarding how to process the field of pure philosophy consisted of solving three tasks:
1) what can I know? (metaphysics);
2) what should I do? (morality);
3) what may I hope for? (religion);