speculation

74. A doubt may arise in our mind that since to obtain the grace of humility we must ask it of God, and ask it with humility if we wish God to hear our prayer, how can we possibly ask with humility since it is precisely that humility which we have not and for which we are asking? Do not let us lose ourselves in such speculations, which are useless in practice, since "Simplicity of heart is what the Lord desires of us."[Wisd. i, 1]
There are certain efficacious virtues that God has infused into our souls in holy Baptism, independently of our own dispositions, "principally by infusion in Baptism," says St. Thomas. Such, for example, is faith, and such also is that humility which is necessary for us so that we may believe and pray as we ought. Let us therefore exercise in our prayers this infused humility, and in making good use of it we shall in time acquire that other evangelical virtue which is necessary to our salvation and which can only be obtained by our own co-operation.
Prayer, says St. Augustine, is essentially the resource of him who knows that he is both poor and needy: "Prayer is only for the needy." ["Oratio non est nisi indigentium" (Enarr. in Ps. xxvi] Let us acknowledge and confess our poverty and indigence before God, and by this confession we shall exercise humility. The really poor do not need to be taught how to ask alms humbly. Necessity is their master, and if man can humble himself before man, why should he not also humble himself before God?
If we wish to discern what belongs to God and that which is our own, it is sufficient for us to reflect that by rendering to God all that is His, nothing is left to ourselves but nothingness. So that we can truly say with the prophet: "I am brought to nothing." [Ps. lxxii, 21] This is a true saying, that all that is within us that is more than nothingness belongs to God, and He can take away what is His when He chooses without doing us any wrong.
Therefore in what can we pride ourselves, since God can take anything away from us the moment that we begin to glory in it?
For he who glories in his wealth may soon become poor; he who glories in his health may suddenly become infirm; he who glories in his knowledge may suddenly become insane; he who glories in his holiness may suddenly fall into some great sin. What vanity, what folly, then, to glory in that which is not our own, nor even in our power to keep! "What hast thou that thou hast not received?" [1 Cor. iv, 7]
This reflection alone should suffice to make us humble, and it may be said that all true humility depends upon our persevering seriously in this thought. Oh, my soul, thou shalt be humbled when, as God says by the prophet, He will "separate the precious from the vile." [Jer. xv, 19] Thus the essence of humility consists in knowing how to discern rightly that which is mine, and that which belongs to God. All the good I do comes from God, and nothing belongs to me but my own nothingness. What was I in the abyss of eternity? A mere nothing. And what did I do of myself to emerge from that nothingness? Nothing. If God had not created me, where should I be? In nothingness. If God did not uphold me at every turn, whither should I return? Into nothingness. Therefore it is clear that I possess nothing of myself but nothingness. Even in my moral being I possess nothing but my own wickedness. When I do evil it is entirely my own work, when I do good it belongs to God alone. Evil is a work of my own wickedness; good is a work of God's mercy. In this way we separate the precious from the vile; this is the art of all arts, the science of sciences, and the wisdom of the Saints.