John Trapp on Matthew 21:18

Verse 18. As he returned into the city] There his work lay chiefly: thither therefore he repaires betimes, and forgat, for haste, to take his breakfast, as it may seem: for ere he came to the city he was hungry, though it were but a step thither. A good mans heart is where his calling is: Such a one, when he is visiting friends or so, is like a fish in the aire: whereinto if it leap for recreation or necessity, yet it soon returns to his own element.