"Eternal Life" is life itself, real life, which can also be lived in the present age and is no longer challenged by physical death.

Do you know what eternal life is? You think it's everlasting life. But your own theologians will tell you that that is crazy, because everlasting is still within time. It is time perduring forever. Eternal means timeless — no time. The human mind cannot understand that. The human mind can understand time and can deny time. What is timeless is beyond our comprehension. Yet the mystics tell us that eternity is right now. How's that for good news? It is right now. People are so distressed when I tell them to forget their past. They're crazy! Just drop it! When you hear "Repent for your past," realize it's a great religious distraction from waking up. Wake up! That's what repent means. Not "weep for your sins.": Wake up! understand, stop all the crying. Understand! Wake up!

This present moment, since it knows neither past nor future, is itself timeless, and that which is timeless is Eternal. Thus “the eternal life belongs to those who live in the present.

If we take eternity to mean not infinite temporal duration but timelessness, then eternal life belongs to those who live in the present.

If we take eternity to mean not infinite temporal duration, but timelessness, then eternal life belongs to those who live in the present.

For life eternal is life germinating in that true and only Inclusive Reason, the supreme consciousness of the reality of the City of God, — the Ideal that seats the central reality of each human being in an eternal circle of Persons, and establishes each as a free citizen in the all-founding, all-governing Realm of Spirits

Eternity is life that is beyond time but includes within itself all time but without a before or after. And whoever is taken into the Eternal Nothing possesses all in all and has no 'before or after'. Indeed a person taken within today would not have been there for a shorter period from the point of view of eternity than someone who had been taken within a thousand years ago.

If by eternity is understood not endless temporal duration but timelessness, then he lives eternally who lives in the present.

[T]he word "eternal" must by him be taken to stand for what "temporal" does not and cannot stand for; namely, the unchangeable Ground presupposed by the changing temporal; the necessary as against the contingent; the independent as against the dependent; the primary as against the derivative; the self-existent as against that which exists in and through it; the genuine cause, the causa sui, as against that which is after all nothing but effect, however it may be tied, by the causa sui, in an unrupturable chain of antecedent and consequent. Or we may say it means the noumenon as against the phenomenon; or, in fine, the thing in itself as against the thing in other. That is, the relation between the eternal and the temporal is not, and cannot be, only another case of the temporal relation. The relation is just one of pure reason, and is, in fact, sui generis: the eternal does not precede the temporal by date, but only in logic; it is the sine qua non without which the temporal cannot exist, nor is even conceivable. In brief, throughout my book I mean by the "eternal" simply the Real as contrasted with the apparent; the world of self-active causes as contrasted with the world of derivative effects, in so far passive.

The eternal being exists for ever if he once exists.

The greatest problem is not how to continue but how to exalt our existence. The call for a life beyond the grave is presumptuous, if there is no cry for eternal life prior to our descending to the grave. Eternity is not perpetual future but perpetual presence. He has planted in us the seed of eternal life. The world to come is not only a hereafter but also a here-now.

Life passes, but the conditions of life do not. Air, food, water, the moral sense, the mathematical problem and its solution. These things wait upon one generation much as they did upon its predecessor. What, too, is this wonderful residuum which refuses to disappear when the very features of time seem to succumb to the law of change, and we recognize our world no more ? Whence comes this system in which man walks as in an artificial frame, every weight and lever of which must correspond with the outlines of an eternal pattern? Our spiritual life appears to include three terms in one. They are ever with us, this Past which does not pass, this Future which never arrives. They are part and parcel of this conscious existence which we call Present. While Past and Future have each their seasons of predominance, both are contained in the moment which is gone while we say, "It is here." So the Eternal is with us, whether we will or not, and the idea of God is inseparable from the persuasion of immortality; the Being which, perfect in itself, can neither grow nor decline, nor indeed undergo any change whatever. The great Static of the universe, the rationale of the steadfast faith of believing souls, the sense of beauty which justifies our high enjoyments, the sense of proportion which upholds all that we can think about ourselves and our world, the sense of permanence which makes the child in very truth parent to the man, able to solve the deepest riddle, the profoundest problem in all that is. Let us then willingly take the Eternal with us in our flight among the suns and stars. Experience is our great teacher, and on this point it is wholly wanting. No one on the farther side of the great Divide has been able to inform those on the hither side of what lies beyond.

The eternal life is given to those who live in the present.

To say it again, eternal life is less about a kind of time that starts when we die, and more about a quality and vitality of life now in connection to God.
Eternal life doesn't start when we die;
it starts now. It's not about a life that begins at death; it's about experiencing the kind of life now that can endure and survive even death.