Fr. Reginald Garrigou-Lagrange on the One Thing Necessary

[4] As soon as a man seriously seeks truth and goodness, this intimate [interior] conversation with himself tends to become conversation with God. Little by little, instead of seeking himself in everything, instead of tending more or less consciously to make himself a center, man tends to seek God in everything, and to substitute for egoism love of God and of souls in Him. This constitutes the interior life. No sincere man will have any difficulty in recognizing it. The one thing necessary which Jesus spoke of to Martha and Mary (Luke 10:42) consists in hearing the word of God and living by it.

The interior life [...] is something far more profound and more necessary in us than intellectual life or the cultivation of the sciences, than artistic or literary life, than social or political life. [...]

[The] interior life, or the life of the soul with God, well deserves to be called the one thing necessary, since by it we tend to our last end and assure our salvation. [...]

There are those who seem to think that it is sufficient to be saved and that it is not necessary to be a saint. It is clearly not necessary to be a saint who performs miracles and whose sanctity is officially recognized by the Church. To be saved, we must take the way of salvation, which is identical with that of sanctity. There will be only saints in heaven, whether they enter there immediately after death or after purification in purgatory. No one enters heaven unless he has that sanctity which consists in perfect purity of soul. Every [5] sin, though it should be venial, must be effaced, and the punishment due to sin must be borne or remitted, in order that a soul may enjoy forever the vision of God, see Him as He sees Himself, and love Him as He loves Himself. Should a soul enter heaven before the total remission of its sins, it could not remain there and it would cast itself into purgatory to be purified.

The interior life of a just man who tends toward God and who already lives by Him is indeed the one thing necessary. To be a saint, neither intellectual culture nor great exterior activity is a requisite; it suffices that we live profoundly by God. [...] If people sacrifice so many things to save the life of the body, which must ultimately die, what should we not sacrifice to save the life of our soul, which is to last forever? Ought not man to love his soul more than his body? "Or what exchange shall a man give for his soul?" our Lord adds (Matt. 16:26). "One thing is necessary," He tells us (Luke 10:42). To save our soul, one thing alone is necessary: to hear the word of God and to live by it. Therein lies the best part, which will not be taken away from a faithful soul even though it should lose everything else.

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Source: Fr. Reginald Garrigou-Lagrange, The Three Ages of the Interior Life, trans. by M. Timothea Doyle (Rockford, IL: TAN Books, 1989), 4–5.