Baptism is not the work of man but of Christ, and this sacrament is so holy that it would not be defiled, even if the minister were a murderer.
Isidore of SevilleIt is agreed that all sound which is the material of music is of three sorts. First is harmonica, which consists of vocal music; second is organica, which is formed from the breath; third is rhythmica, which receives its numbers from the beat of the fingers. For sound is produced either by the voice, coming through the throat; or by the breath, coming through the trumpet or tibia, for example; or by touch, as in the case of the cithara or anything else that gives a tuneful sound on being struck.
Isidore of SevilleWe, as Catholics are not permitted to believe anything of our own will, nor to choose what someone has believed of his. We have God's apostles as authorities, who did not themselves of their own wills choose anything of what they wanted to believe, but faithfully transmitted to the nations, the teachings of Christ.
Isidore of Seville