I agree with the transcendental argument because we can comprehend reality as if we exist beyond time and space but how does it follow we are “being-towards-death”?
Tonyrey, sorry about the delay in responding … I’ve been felled by the flu … powerful virus indeed.
Let me clarify “transcendental”. We are not outside space and time - as in Kant, we are “where” space and time happen, it’s almost as if we bring space and time with us but with a strong caveat (and this again from Kant) - space and time are intuitions, that is, they are “given” to us - to use a Super Bowl analogy, we are “receivers” not the quarterbacks - and who is the “giver”? - a great mystery - Heidegger refers us to the “es” in the “es gibt” but the “es” , the “it”, is too impersonal (like the “id” in Freud, mutatis mutandis) - Levinas replaces the “es” with the “Other” (almost like Buber’s “Thou”).
But to return to your comment about comprehending reality as if we were outside space and time.
We are not outside space and time in an ontological sense (maybe early Husserl thought so with his “transcendental ego” but probably not the later Husserl and certainly not his successors like Merleau-Ponty et al).
On the other hand, without us human beings, there would be no space and time.
But we’re not talking about space and time as mathematical abstractions. First and foremost, they are “my” space and “my” time. Where does the sense of “my” come from? Why do I regard my physiological churnings as “mine”? Why do I regard my face as “mine”?
As Heidegger argues, it is my “being-towards-death”, towards the “ownmost” possibility of no longer being here on earth, of having run out of possibilities (possibilities in a worldly sense - I don’t think this conflicts with Catholic teaching) - it is this life-long anticipation of my own personal mortality which leads me to become aware of “my thereness”, “my self”. There’s much more that can be said, especially our being-with-others, but that will have to be deferred.