Place no hope in the feeling ...

Place no hope in the feeling of assurance, in spiritual comfort. You may well have to get along without this. Place no hope in the inspirational preachers of Christian sunshine, who are able to pick you up and set you back on your feet and make you feel good for three or four days-until you fold up and collapse into despair. Self-confidence is a precious natural gift, a sign of health. But it is not the same thing as faith. Faith is much deeper, and it must be deep enough to subsist when we are weak, when we are sick, when our self-confidence is gone, when our self-respect is gone.
Place no hope in the feeling of assurance, in spiritual comfort. You may well have to get along without this. Place no hope in the inspirational preachers of Christian sunshine, who are able to pick you up and set you back on your feet and make you feel good for three or four days-until you fold up and collapse into despair. Self-confidence is a precious natural gift, a sign of health. But it is not the same thing as faith. Faith is much deeper, and it must be deep enough to subsist when we are weak, when we are sick, when our self-confidence is gone, when our self-respect is gone.

Quotes from the same author

The man who fears to be alone will never be anything but lonely, no matter how much he may surround himself with people. But the man who learns, in solitude and recollection, to be at peace with his own loneliness, and to prefer its reality to the illusion of merely natural companionship, comes to know the invisible companionship of God. Such a one is alone with God in all places, and he alone truly enjoys the companionship of other men, because he loves them in God in Whom their presence is not tiresome, and because of Whom his own love for them can never know satiety.
The married man and the mother of a Christian family, if they are faithful to their obligations, will fulfill a mission that is as great as it is consoling: that of bringing into the world and forming young souls capable of happiness and love, souls capable of sanctification and transformation in Christ.
And it is in this darkness, when there is nothing left in us that can please or comfort our own minds, when we seem to be useless and worthy of all contempt, when we seem to have failed, when we seem to be destroyed and devoured, it is then that the deep and secret selfishness that is too close to us for us to identify is stripped away from our souls. It is in this darkness that we find liberty. It is in this abandonment that we are made strong. This is the night which empties us and makes us pure.
There is in all visible things an invisible fecundity, a dimmed light, a meek namelessness, a hidden wholeness. This mysterious unity and integrity is wisdom, the mother of us all, "natura naturans." There is in all things an inexhaustible sweetness and purity, a silence that is a fountain of action and joy. It rises up in wordless gentleness, and flows out to me from the unseen roots of all created being.
The fruitfulness of our lives depends in large measure in our ability to doubt our own words and to question the value of our own work. The man who completely trusts his own estimate of himself is doomed to sterility.