Gregory the Great
Catena Aurea · Matthäusevangelium 4
And Jesus, walking by the sea of Galilee, saw two brethren, Simon called Peter, and Andrew his brother, casting a net into the sea: for they were fishers. And He saith unto them, Follow Me, and I will make you fishers of men. And they straightway left their nets, and followed Him. And going on from thence, he saw other two brethren, James the son of Zebedee, and John his brother, in a ship with Zebedee their father, mending their nets; and He called them. And they immediately left the ship and their father, and followed Him.
(Hom. in Ex. 17:1.) Hereby we are also silently admonished, that he who wants affection towards others, ought not to take on him the office of preaching. The precepts of charity are two, and between less than two there can be no love.