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.
To be enlightened is to be aware, always, of total reality in its immanent otherness - to be aware of it and yet remain in a condition to survive as an animal. Our goal is to discover that we have always been where we ought to be. Unhappily we make the task exceedingly difficult for ourselves.
We create institutions and policies on the basis of the way we make assumptions about us and others. We accept the fact that we will always have poor people around us. So we have had poor people around us. If we had believed that poverty is unacceptable to us, and that it should not belong to a civilized society, we would have created appropriate institutions and policies to create a poverty-free world.
The more we come out and do good to others, the more our hearts will be purified, and God will be in them.
A totally blind process can by definition lead to anything; it can even lead to vision itself.
The scales of reckoning with mortality are never evenly weighted, alas, and thus it is on the shoulders of the living that the burden of justice must continue to rest.
You climb to reach the summit, but once there, discover that all roads lead down.
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