The human spirit, being created and continually dependent on God, is not self-sufficient, because it is not God. Since it is not self-sufficient, it needs to acquire the sufficiency it requires, or to be nourished in the manner proper to it.
Its will hungers for the good as for food. Its mind thirsts for truth as for drink. But the root of good is not in it, nor is the source of truth in it. Therefore it has neither food nor drink within itself. These must be given to it.
In God is the root of good. In God is the source of truth. Therefore the nourishment of the spirit requires not what rises from the earth, but what descends from heaven, manna.
Bread that is purely heavenly, not only in origin but also in its nature, cannot be set openly on the earth before bodily eyes. The water of life cannot be poured into a vessel made of dead matter. Therefore the true food of the spirit is necessarily hidden from the flesh.
The word of God often speaks of this food, so that we may know and feel our essential hunger and find saving nourishment.
And Incarnate Wisdom says: "I am the living bread which came down from heaven. If anyone eats of this bread, he will live forever" (Jn 6:51).
And He says to the Samaritan woman: "Whoever drinks of the water that I shall give him will never thirst. But the water that I shall give him will become in him a fountain of water springing up into eternal life" (Jn 4:14).
And again: "Man shall not live by bread alone, but by every word that proceeds from the mouth of God" (Mt 4:4).
And the Apostle describes true Christians as those "who have tasted the heavenly gift, and have become partakers of the Holy Spirit, and have tasted the good word of God and the powers of the age to come" (Heb 6:4-5).
Will some say that these are only figures? Let us grant, if they wish, that this is true. Yet spiritual things by their nature contain more reality and power than bodily things.
Therefore these figures and likenesses, if one wishes to call them so, must contain more reality and power than the things from which they are borrowed.
If the thought of bodily food and of its necessity is not a dream, then much more the thought of spiritual food and of its necessity is truth.
Will someone ask how the nourishment of the spirit can be conceived, since the spirit, as a simple being, knows neither loss nor increase? I answer that everything in the spirit must be understood spiritually.
A body deprived of its proper food is finally destroyed, but the spirit cannot be destroyed. Yet as the body is distressed and weakened by excessive prolonged hunger, so the spirit is distressed and weakened without the food proper to it.
These states belong even more to the spirit than to the body. The body can have living strength and the sensation of pleasure only through the action of the spirit.
As bodily food and nourishment delight, strengthen, calm, and satisfy the sensual man, so spiritual food gives the spiritual man inward, heartfelt, and noetic delight, strengthening, peace, and satisfaction.
Some may also ask why we do not feel within ourselves this supposed spiritual hunger or thirst. Let them add another question to this.
Why, when we hear the word of God, which is called bread or the water of life, do we not notice in our soul living sensations of delight or inward nourishment? And why, when the word falls silent, do we soon remain as empty as before?
To answer this, ask a man whose taste and natural disposition toward nourishment have been damaged by sickness or gross incapacity: why is food not sweet to him?
Why does he not wish to take it? Or why, after taking it without being nourished, does he disorderly cast it out?
Unbridled sensuality and earthly passions enfeeble the spirit. They stifle its inward sensations and corrupt its heavenly desires.
For this reason the hidden manna is not promised to everyone. What benefit is there, and how is it possible, to give food to one in whom sickness has produced aversion to it and incapacity for nourishment?
When the body overcomes the sickness that fights against it, then it can make use of food. When the spirit conquers sensuality and the passions, then it will be able, in spiritual health, to eat of the hidden manna.
"He who has an ear, let him hear what the Spirit says to the churches: To him who overcomes I will give to eat of the hidden manna."