Keep this faith ever by your side to help you on your way and close your ears and have nothing to do with any other, even if I myself should change my allegiance and preach another faith to you or an angel of darkness be transformed into an angel of light to lead you into error… To begin with, simply take the words of the Creed as they stand at their face value, put your faith in them and commit them to memory.
Later, as opportunity offers, you can take the propositions one by one and study them as truths of the Sacred Scriptures. Pay attention then, brethren, to the truths of the Faith now being handed down to you and write them deep in your hearts. Keep a careful watch and be on your guard against foes and heretics intent on perverting your faith and plundering it. You must, as it were, deposit this gift of faith in the bank of safe-keeping and God will demand of you an account of your investment.
In the presence of God, who gives life to all things, and of Christ Jesus who is his testimony before Pontius Pilate bore witness to that great claim, I charge you to keep the faith unstained until the appearing of our Lord Jesus Christ.
--Saint Cyril of Jerusalem
