The material below is take from Spiritual Theology by Fr. Jordan Aumann, O.P., Chapter 2. If you desire to read the entire chapter or even the entire book you can download it for free here.
These few quotes speak to the concept of God’s
glory and the means to attain it.
The
Son of God came into this world that we might have life and have it to the full
(John 10:10). Indeed, "the ultimate purpose of all things is that, in
Christ, all persons made by God,s creative love might freely
come to him and share the abundant life of the Blessed Trinity."
This
mysterious evolution by which Christ himself is formed in us is the principal
purpose of divine revelation and the basis for all growth and development. To
this evolution is ordained the divine light of faith, to it the entire gospel,
to it the institution of the Church and
even the incarnation of the divine Word. For faith is ordained to charity,
which is the bond of perfection; and the dogmas of our faith... are not so much
for finding intellectual satisfaction as for motivating us to seek the gift of
God, the living water of the Holý Ghost, and the power of his vivifying grace.
The Gospel was written that "believing, you may have life in his
name" (John 20:31), and the purpose of the Church is the sanctification of
souls.
The
life received from Jesus Christ through the Holy Spirit respects our human
condition at the same time that it elevates us to the supernatural order and
makes us capable of performing actions that are likewise supernatural.
The
spiritual life has three distinct goals or, if one prefers, it has one ultimate
goal and two relative or proximate goals. The ultimate goal of the spiritual
life, as of all things in creation, is the glory of God; the proximate goals are
our sanctification and salvation.
"I
am the Lord, this is my name; my glory I give to no other, nor my praise to
idols" (Isa. 42:8). It follows, therefore, that God created all things for
himself; all created things exist in and for God.
The
extrinsic glory of God should be understood first of all as a sharing in the
beauty, truth, and goodness that constitute God’s
intrinsic glory. Thus the statement of St. Paul: "Since the creation of
the world, invisible realities, God’s
eternal power and divinity, have become visible, recognized through the things
he has made" (Rom. 1:20).
…
by a prodigy of love that we can never sufficiently admire, much less worthily
acknowledge, he condescended to super-naturalize us from the beginning by
elevating us to nothing less than his own status, to make us share in his life,
his infinite power, his own operations, and his eternal happiness.
…
the glory of God is seen as a striving for greater perfection whereby God is
praised and glorified. In fact, in spiritual writing the phrase "glory of
God" usually signifies the adoration and praise that are stimulated by the
recognition of God’s perfections as reflected in the beauties of the universe
or the good deeds of individual persons.
As
Christian souls make progress along the road to perfection, they come to an
ever clearer realization that their personal sanctification and even their
perfect happiness in heaven are not the ultimate goal of the spiritual life;
rather, one's sanctification and salvation are the most excellent and
efficacious means of giving glory to the Trinity.
Beatitude
or perfect happiness, says St. Thomas, constitutes Man's ultimate perfection. It
cannot be realized in this life, which is a time of pilgrimage and vigil,
because St. John writes: "What we shall later be has not yet come to
light. We know that when it comes to light we shall be like him, for we shall
see him as he is .... Our love is brought to perfection in this, that we should
have confidence on the day of judgment" (1 John 3:2; 4:17).
Does
this mean that only those souls can enter glory that have reached a high degree
of grace and spiritual perfection? To answer this question it is necessary to
make a distinction between salvation as being saved, and salvation as the state
of glory or the actual enjoyment of perfect happiness in heaven. Salvation is
achieved by all those who die in the state of grace, even in a minimal degree,
but this does not mean that all the souls of the just enter immediately into
the beatitude of glory. It is explicitly defined by the Church that those who
die in the state of grace and are in no need of further purification will enter
glory immediately after death, but those who still need to be purified will
enter heaven only when their purification is completed.