A Definition of Eternity

From Boethius:

''The simultaneously-whole and perfect possession of interminable life''

Commentary from Fr. Reginald Garrigou-Lagrange, O.P. :

'We must come to the knowledge of eternity by means of time. But time is but the numbering of movement by before and after. Contrary to this, in the duration of that which is without movement, there is absolute uniformity, without any before or after. Moreover, what is absolutely immutable is interminable, without beginning and end, whereas those things that are measured by time have a beginning and an end. Contrary to this, our life is not simultaneously whole, for it consists of the distinct periods of infancy, youth.... (etc). Hence the now of time is the current now between the past and the future, so that past and future do not actually exist but exist only in the mind, whereas the now of eternity is a standing now, which is absolutely permanent and immobile...''