The revelation of the eternal is a transcendental experience where we perceive a timeless and immutable dimension of reality. This “eternity” is different from duration: it is a state of being where time seems to stop.
Christian mystics: Saint Teresa of Avila or Master Eckhart spoke of a union with the divine where the soul “gets lost” in the eternal present of God.
Outside of religion: Philosophers like Heidegger speak of the authentic moment when we face being itself, freed from temporal contingencies
Imagine a moment when you are contemplating a landscape, totally absorbed, where time seems to disappear. This moment of pure presence could be a “window” towards the eternal.