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.