James indicates when he says: "You ask much and receive not, because ye ask amiss." For where this faith and confidence is not in the prayer, the prayer is dead, and nothing more than a grievous labor and work. If anything is given for it, it is none the less only temporal benefit without any blessing and help for the soul; nay, to the great injury and blinding of souls, so that they go their way, babbling much with their mouths, regardless of whether they receive, or desire, or trust; and in this unbelief, the state of mind most opposed to the exercise of faith and to the nature of prayer, they remain hardened.
From this it follows that one who prays aright never doubts that his prayer is surely acceptable and heard, although the very thing for which he prays be not given him. For we are to lay our need before God in prayer, but not prescribe to Him a measure, manner, time or place; but if He wills to give it to us better or in another way than we think, we are to leave it to Him; for frequently we do not know what we pray, as St. Paul says, Romans viii; and God works and gives above all that we understand, as he says, Ephesians iii, so that there be no doubt that the prayer is acceptable and heard, and we yet leave to God the time, place, measure and limit; He will surely do what is right. They are the true worshipers, who worship God in spirit and in truth. For they who believe not that they will be heard, sin upon the left hand against this Commandment, and go far astray with their unbelief.
But they who set a limit for Him, sin upon the other side, and come too close with their tempting of God. So He has forbidden both, that we should err from His Commandment neither to the left nor to the right, that is, neither with unbelief nor with tempting, but with simple faith remain on the straight road, trusting Him, and yet setting Him no bounds.
VI. Thus we see that this Commandment, like the Second, is to be nothing else than a doing and keeping of the First Commandment, that is, of faith, trust, confidence, hope and love to God, so that in all the Commandments the First may be the captain, and faith the chief work and the life of all other works, without which, as was said, they cannot be good.
But if you say: "What if I cannot believe that my prayer is heard and accepted?" I answer: For this very reason faith, prayer and all other good works are commanded, that you shall know what you can and what you cannot do. And when you find that you cannot so believe and do, then you are humbly to confess it to God, and so begin with a weak spark of faith and daily strengthen it more and more by exercising it in all your living and doing. For as touching infirmity of faith (that is, of the First and highest Commandment), there is no one on earth who does not have his good share of it. For even the holy Apostles in the Gospel, and especially St. Peter, were weak in faith, so that they also prayed Christ and said: "Lord, increase our faith "; and He very frequently rebukes them because they have so little faith.
Therefore you shall not despair, nor give up, even if you find that you do not believe as firmly as you ought and wish, in your prayer or in other works. Nay, you shall thank God with all your heart that He thus reveals to you your weakness, through which He daily teaches and admonishes you how much you need to exercise yourself and daily strengthen yourself in faith. For how many do you see who habitually pray, sing, read, work and seem to be great saints, and yet never get so far as to know where they stand in respect of the chief work, faith; and so in their blindness they lead astray themselves and others; think they are very well off, and so unknowingly build on the sand of their works without any faith, not on God's mercy and promise through a firm, pure faith.
Therefore, however long we live, we shall always have our hands full to remain, with all our works and sufferings, pupils of the First Commandment and of faith, and not to cease to learn. No one knows what a great thing it is to trust God alone, except he who attempts it with his works.
VII. Again: if no other work were commanded, would not prayer alone suffice to exercise the whole life of man in faith? For this work the spiritual estate has been specially established, as indeed in olden times some Fathers prayed day and night. Nay, there is no Christian who does not have time to pray without ceasing. But I mean the spiritual praying, that is: no one is so heavily burdened with his labor, but that if he will he can, while working, speak with God in his heart, lay before Him his need and that of other men, ask for help, make petition, and in all this exercise and strengthen his faith.
This is what the Lord means, Luke xviii, when He says, "Men ought always to pray, and never cease," although in Matthew vi. He forbids the use of much speaking and long prayers, because of which He rebukes the hypocrites; not because the lengthy prayer of the lips is evil, but because it is not that true prayer which can be made at all times, and without the inner prayer of faith is nothing. For we must also practise the outward prayer in its proper time, especially in the mass, as this Commandment requires, and wherever it is helpful to the inner prayer and faith, whether in the house or in the field, in this work or in that; of which we have no time now to speak more. For this belongs to the Lord's Prayer, in which all petitions and spoken prayer are summed up in brief words.
VIII. Where now are they who desire to know and to do good works?
Let them undertake prayer alone, and rightly exercise themselves in faith, and they will find that it is true, as the holy Fathers have said, that there is no work like prayer. Mumbling with the mouth is easy, or at least considered easy, but with earnestness of heart to follow the words in deep devotion, that is, with desire and faith, so that one earnestly desires what the words say, and not to doubt that it will be heard: that is a great deed in God's eyes.