From Potency and Act, her phenomenological study of the concepts of Thomistic philosophy:
I am conscious of myself in my actual being, and I am conscious of this being. My being is momentary, but it cannot be as purely momentary. Actual being emerges from a potential being and passes into a potential being, but all potentiality is phenomenally upheld [halten] by actuality and it cannot uphold [Halt geben] actuality. What upholds me in my temporally discrete existence between being and nonbeing? When I have pressed ahead into the transcendent sphere, I may conceive of the substance evinced in my flowing actual being as the bearer of this being.
...Can anything uphold [Halt geben] my frail [hinfällig] being, which touches upon genuine existence [Existenz] only from one instant to another, save true being wherein nothing of nonbeing is found and which stands changeless by itself alone, unable to have, nor needing, any other upholding [Halt]? And does not the very frailty of my own being lend certainty--not only to the idea but to the reality [Realität] of this pure, true, "absolute [absolut]" being?
[Edith Stein, Potency and Act, Redmond, tr., ICS Publications (Washington, DC: 2009) pp. 20-21.]