Adam Clarke on Matthew 19:27

We have forsaken all - "A poor all," says one, "a parcel of rotten nets." No matter - they were their All, whether rotten or sound; besides, they were the all they got their bread by; and such an all as was quite sufficient for that purpose: and let it be observed, that that man forsakes much who reserves nothing to himself, and renounces all expectations from this world, taking God alone for his portion. See Mat 4:20.

To forsake all, without following Christ, is the virtue of a philosopher. To follow Christ in profession, without forsaking all, is the state of the generality of Christians. But to follow Christ and forsake all, is the perfection of a Christian.

What shall we have therefore? - Τι αρα εϚαι ημιν, What Reward shall we get? This Kypke proves to be the meaning of the words from some of the best Greek writers.