John 13:27

And after the sop Satan entered into him. — The Greek expresses more vividly the very moment when the mind finally cast out love, and left itself as a possession for Satan. “And after the sop, then Satan entered into him.” It was at that moment, when the last effort had been tried, and tried in vain, when the heart hardened itself to receive from Jesus the sacred pledge of love, while it was plotting in black hatred how to betray Him; it was then that hope took her flight from a realm of gloom where she could no longer dwell, and light ceased to shine in a darkness that would not comprehend it.

Then said Jesus unto him. — Better, Jesus therefore said unto him. It was because He read the secrets of the heart, and saw that it was wholly given up to evil that He said it.

That thou doest, do quickly. — The Greek is exactly, more quickly. “Carry out your plans even more quickly than you have proposed. Do the fatal deed at once. It is resolved, and every effort to win thee has failed. A fixed resolve is nothing less than the deed itself.”