Saint Leo the Great affirmed, “Unless faith be one, it is not the faith”. Pope Francis, in his encyclical Lumen fidei, commented on this, writing: “What is the secret of this unity? Faith is ‘one’, in the first place, because of the oneness of the God Who is known and confessed.
San León Magno afirmaba: «Si la fe no es una, no es fe», lo que el Papa Francisco, en su encíclica Lumen fidei, comenta del siguiente modo: «¿Cuál es el secreto de esta unidad?