In that day you will know that I am in my Father, and you in me, and I in you.
20. At that day Some refer this to the day of Pentecost; but it rather denotes the uninterrupted course, as it were, of a single day, from the time when Christ exerted the power of his Spirit till the last resurrection. From that time they began to know, but it was a sort of feeble beginning, because the Spirit had not yet wrought so powerfully in them.
When friends are parting, it is a common request they make to each other, "Pray let us hear from you as often as you can:" this Christ engaged to his disciples, that out of sight they should not be out of mind. I.
Commenting on John 14:18-24
At that day ye shall know,.... The things they should know, or the objects of knowledge are, that I am in my Father; in his bosom, in union with him, partaker of the same nature, perfections, and glory with him, and equal to him: and you in me: that they were in union with him as the branches in the vine, and as the members...