13 Therefore on the Saturday when by the grace of God you will keep the Vigil, you will have to repeat not the Prayer, but the Creed. For if you do not know the Creed now, you will not hear that every day in the Church, and among the people. But when you have learned it, that you may not forget it, say it every day when you rise; when you are preparing for sleep, rehearse your Creed, to the Lord rehearse it, remind yourselves of it, and be not weary of repeating it.
For repetition is useful, lest forgetfulness steal over you. Do not say, “I said it yesterday, I have said it today, I say it every day, I know it perfectly well.” Call your faith to mind, look into yourself, let your Creed be as it were a mirror to you. Therein see yourself, whether you believe all which you profess to believe, and so rejoice day by day in your faith. Let it be your wealth, let it be in a sort the daily clothing of your soul. Do you not always dress yourself when you rise.
So by the daily repetition of your Creed dress your soul, lest haply forgetfulness make it bare, and you remain naked, and that take place which the Apostle says, (may it be far from you!) “If so be that being unclothed, we shall not be found naked.” For we shall be clothed by our faith: and this faith is at once a garment and a breastplate; a garment against shame, a breastplate against adversity. But when we shall have arrived at that place where we shall reign, no need will there be to say the Creed. We shall see God; God Himself will be our vision; the vision of God will be the reward of our present faith.
Source: Sermons on Selected Lessons of the New Testament (New Advent)