The ordinary experience of time involves three apparent components: the past (what has been), the present (what is) and the future (what will be). In ordinary consciousness, the present seems to be a knife's edge — an infinitesimally thin boundary between a dead past and an unborn future, perpetually slipping away before it can be grasped. This experience of the present as fleeting, as constantly becoming past, is so universal that it seems simply true.
But when attention is brought fully and completely into the present moment — without the mental overlay of past memories or future plans — something unexpected happens. The present does not feel like a knife's edge. It feels vast. The present moment, fully inhabited, reveals itself as the only thing that is actually real — and as containing, rather than excluding, a quality of timelessness. The eternal now is not the absence of time but the presence that reveals itself when time's apparent flow is seen through.
This is what Meister Eckhart called the nunc stans — the standing now. Not the flowing now (nunc fluens) of the clock, but the now that does not pass because it is the ground from which all passing arises. Augustine expressed it differently: "Our heart is restless until it rests in Thee" — the eternal now is the resting point, the home that the self has been seeking in time and can only find in its absence. The Zen tradition points at it through koans designed to stop the conceptual mind so that what is always already present can be recognised.
Crucially, the eternal now is not an altered state available only to advanced meditators. It is the ground of every moment of experience — the awareness that is always present even when it is not noticed, like the screen that is always there whether the film showing on it is beautiful or terrible. Spiritual practice does not create the eternal now. It removes the habitual patterns of thought that prevent its recognition.