A great safeguard is the entire faith, the true faith, in which neither anything whatever can be added by anyone nor anything taken away; for, unless faith be one, it is not the faith.
Interpretation
Faith should remain pure and unaltered to retain its true essence.
Pope Leo I emphasizes the importance of maintaining the integrity of faith, suggesting that it cannot be diluted or modified without losing its essential truth. He argues that true faith is singular and intact; any alteration, whether addition or subtraction, compromises its validity and effectiveness as a guiding principle in life.
In practice
During a discussion on religious beliefs, you might quote this to emphasize the importance of keeping faith pure.
The faith of those who live their faith is a serene faith. What you long for will be given you; what you love will be yours for ever. Since it is by giving alms that everything is pure for you, you will also receive that blessing which is promised next by the Lord: the Godhead that no man has been able to see. In the inexpressible joy of this eternal vision, human nature will possess what eye has not seen or ear heard, what man's heart has never conceived.
The Church is a virgin, the bride of one Spouse, Who is Christ, and this Church does not allow herself to be violated by any error; so that, throughout the whole world there may be for us one uncorruptedness of a single chaste communion.
No one, however weak, is denied a share in the victory of the cross. No one is beyond the help of the prayer of Christ.
The devil is always discovering something novel against the truth.
David's Lord was made David's Son, and from the fruit of the promised branch sprang One without fault, the two-fold nature coming together in one Person, that by one and the same conception and birth might spring our Lord Jesus Christ, in Whom was present both true Godhead for the performance of mighty works and true Manhood for the endurance of sufferings.
Teach nothing new, but instill into all men's breasts those things which the Fathers of revered memory have with harmony of statement taught... Preach nothing else than what we received from our forefathers... Accordingly, both in the rule of faith and in the observance of discipline, let the standard of antiquity be maintained throughout.
I only wish that ordinary people had an unlimited capacity for doing harm; then they might have an unlimited power for doing good.
If there is one word that you find coming out like a bomb from the Upanishads, bursting like a bombshell upon masses of ignorance, it is the word "fearlessness."
Whenever books are burned, men also in the end are burned.
(W)e do not count heads before enforcing the First Amendment.
Reckoned physiologically, everything ugly weakens and afflicts man. It recalls decay, danger, impotence; he actually suffers a loss of energy in its presence. The effect of the ugly can be measured with a dynamometer. Whenever man feels in any way depressed, he senses the proximity of something ugly. His feeling of power, his will to power, his courage, his pride - they decline with the ugly, they increase with the beautiful.
The Catholics have a Pope. Protestants laugh at them, and yet the Pope is capable of intellectual advancement. In addition to this, the Pope is mortal, and the church cannot be afflicted with the same idiot forever. The Protestants have a book for their Pope. The book cannot advance. Year after year, and century after century, the book remains as ignorant as ever.
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