Matthew 8:18

(ubi sup.) It is clear that this day on which they went over the lake was another day, and not that which followed the one on which Peter's mother-in-law was healed, on which day Mark and Luke relate that He went out into the desert. (De Cons. Ev. ii. 23.) Matthew relates that this was done when He gave them commandment that they should go over the lake, Luke, that it happened as they walked by the way; which is no contradiction, for they must have walked by the way that they might come to the lake.

But it is only to the disciples that Jesus "gave orders to cross over to the other side," lest, from the crowds pressing about him, his disciples should be prevented from hearing those very teachings that were most appropriate for them. To the disciples he revealed God's future mysteries more deeply than in the things that were spoken to the crowds only "in parables." Only the disciples had left behind all present goods and followed him through love of learning. He commands them to cross over from temporary things to eternal things, from the earthly to the heavenly, from the carnal to the spiritual.

Or; He did this as one desiring to shun the thronging of the multitude. But they hung upon Him in admiration, crowding to see Him. For who would depart from one who did such miracles? Who would not wish to look upon His open face, to see His mouth that spoke such things? For if Moses' countenance was made glorious, and Stephen's as that of an Angel, gather from this how it was to have been supposed that their common Lord must have then appeared; of whom the Prophet speaks, Thy form is fair above the sons of men. (Ps. 45:2.) What happened between the command of the Lord given, and their crossing over, the Evangelist purposes to relate in what follows; And one of the Scribes came to him and said, Master, I will follow thee whithersoever thou goest.