Truly, truly, I tell you, whoever believes in Me will also do the works that I am doing. He will do even greater things than these, because I am going to the Father.
12. Verily, verily, I, tell you. All that he had hitherto told his disciples about himself, so far as it regarded them, was temporal; and, therefore, if he had not added this clause, the consolation would not have been complete; particularly since our memory is so short, when we are called to consider the gifts of God.
The disciples, as they were full of grief to think of parting with their Master, so they were full of care what would become of themselves when he was gone; while he was with them, he was a support to them, kept them in countenance, kept them in heart; but, if he leave them, they will be as sheep having no shepherd, an easy prey...
Commenting on John 14:12-14
Verily, verily, I say unto you, he that believeth on me,.... Having mentioned his miracles as proofs of his deity, he assures his disciples, in order to comfort them under the loss of his bodily presence, that they should do the same, and greater works; for we are not to understand these words of everyone that believes in Christ, of every private believer in him...