The fact that it used to be called the Holy Ghost and had only fairly recently been changed to Holy Spirit to make it seem more credible, cut no ice at all with me. Our Lord does speak continually throughout each of the four Gospels, of the spirit alone giving life, that the flesh is of no avail, that we have to pray in the spirit, and that the spirit lights the world. In the Book of the Acts of the Apostles, we are told the Holy Spirit manifested itself as a wind and as tongues of fire, but there has to be much more to it even than those particular illustrations might suggest. One way in which we can try to understand that which the word spirit signifies is by putting a simple, human interpretation on it such as pure energy, but even that description is really quite meaningless as we cannot completely grasp the true nature of pure energy. In fact, it would be 10infinity years which bring us right back to where we were before.
Finite creatures are totally unable to understand that which lasts forever.
When it was discovered that the universe was dying as an outcome of the uncompromising effect of the second law, many scientists, philosophers, and Christians became despondent at the prospect. Infinity is representative of a time-scale that is qualitatively different in the sense that it never comes to an end. As both of the latter propositions are, to me, totally inconceivable, I therefore believe Him absolutely when He tells me that life for eternity awaits those that take Him into themselves, and that eternity means just that. So it is likely that eternity is simply a place where linear time does not exist and therefore does not possess meaning, and those who inhabit eternity, will, therefore, have neither memories nor expectations but will simply 'be'. Each moment of eternity will be a fresh, not remembered experience.