John Chrysostom — as excerpted in the Catena Aurea on Matthew 20:20-23

“He says therefore, Can ye drink it? as much as to say, You ask me of honours and crowns, but I speak to you of labour and travail, for this is no time for rewards. He draws their attention by the manner of His question, for He says not, Are ye able to shed your blood? but, Are ye able to drink of the cup? then He adds, which I shall drink of?”