Fulgentius of Ruspe

Hence it is that any creatures, that is, of the same nature, can be separated from one another because each one individually cannot be everywhere in its entirety; for when, through the grace of faith it happens that they have “one heart and soul of the multitude of believers,” still in their persons they can be separated by being in different places even though they are not separated by the affection of the heart; and some of the faithful can become unbelievers and be severed from the fellowship of that one soul.