It will be observed that in St. Matthew (Luke 20:20). He while Salome is represented as the person who makes the request, the answer is given, not to her, but to her sons. Ye know not what ye ask. Our Lord knew that the sons had spoken in the mother and by the mother. They knew not what they asked
Are ye able to drink the cup that I drink? or to be baptized with the baptism that I am baptized with? It is as though he said, "It is by my cross and passion that I am to attain to the kingdom; therefore the same way must be trodden by you who seek the same end." Our Lord here describes his passion as his cup. The "cup" everywhere in Holy Scripture, as well as in profane writers, signifies a man's portion, which is determined for him by God, and sent to him. The figure is derived from the ancient custom at feasts, by which the ruler of the feast tempered the wine according to his own will, and appointed to each guest his own portion, which it was his duty to drink. Our Lord then proceeds to describe his passion, which he had already spoken of as his cup, as his baptism. He uses this image because he would be totally buried, immersed, so to speak, in his passion. But it seems probable that the idea of purification entered into this image. It was a baptism of fire into which he was plunged, and out of which he came forth victorious. The fire of his bitter passion and death tried him. It was his "salting with fire." It pleased God thus to "make the Captain of our salvation perfect through sufferings." Our Lord asks these ambitious disciples whether they could drink his cup of suffering, and be baptized with his fiery baptism.