(following on from here)

Who indeed can comprehend what an abundance of goodness is contained in that brief expression: “God will be all in all”?

Not to speak of the body, I discern in the soul three faculties, the reason, the will, the memory, and these three may be said to be identified with the soul itself.

Everyone who is guided by the Spirit realizes how greatly in the present life these three are lacking in integrity and perfection.

And what reason can there be for this, except that God is not yet “all in all”?

Hence it comes about that the reason very often falters in its judgments, the will is agitated by a fourfold perturbation and the memory confused by its endless forgetfulness.

Man, noble though he be, was unwillingly been subjected to this triple form of futility, but hope nonetheless was left to him.

For he who satisfies with good the desire of the soul will one day himself be for the reason, fullness of light, for the will, the fullness of peace, for the memory, eternity’s uninterrupted flow.

Truth! Love! Eternity! Oh blessed and beatifying Trinity!

To you the wretched trinity that I bear within me sends up its doleful yearnings because of the unhappiness of its exile.

Departing from you, in what errors, what pains, what fears it has involved itself!

[…] And still, why so downcast, my soul, why do you sigh within me?

Put your hope in God. I shall praise him yet, when error will have gone from the reason, pain from the will, and every trace of fear from the memory.

Then will come that state for which we hope, with its admirable serenity, its fullness of delight, its endless security.

The God who is truth is the source of the first of these gifts; the God who is love, of the second; the God who is all-powerful, of the third.

And so it will come to pass that God will be all in all, for the reason will receive unquenchable light, the will imperturbable peace, the memory an unfailing fountain from which it will draw eternally.

I wonder if it seems right to you that we should assign that first operation to the Son, the second to the Holy Spirit, the last to the Father.

[…] Consider too that the children of this world experience a corresponding threefold temptation from the allurements of the flesh, the glitter of life in the world, the self-fulfillment patterned on Satan.

These three include all the artifices by which the present life deceives its unhappy lovers, even as St John proclaimed: “All that is in the world is the lust of the flesh and the lust of the eyes and the pride of life.”

Bernard of Clairvaux (1090-1153): Sermons on the Song of Songs, 11, 5-6.