Theophylact of Ohrid

That is, they differ among themselves, and do not have one and the same concern, but are divided in their cares: one is concerned with such matters, and the other with others. Since their concerns are different, one must choose those among them which are better and easier.

Commentary on 1 Corinthians ↗

Bonaventure

To that objection, that he who has a wife is anxious, etc.: it must be said that solicitude is twofold: one kind is under God, and this is called distracting and occupying solicitude; the other kind leads to forgetfulness of God, and this is suffocating solicitude: similarly a distinction must be made concerning friendship as well. The Apostle, however, speaks of the first kind, and the argument proceeds from the second.

Disputed Questions on Evangelical Perfection, Question 3 ↗