William Burkitt on John 13:33

Observe here, An endearing compellation, a sweet title given by Christ to his disciples, Little Children; intimating that tender affection which he bears unto them, though now upon the point of departing from them.

Learn thence, That whatever Christ's dealings are, or may be with his people, in respect to his removing or withdrawing from them, yet he still retains the relation of a Father to them, and will in his absence from them, exercise such a care over them, as parents have of their young and tender children; so much doth the title of little children imply and import.

Observe farther, The plain intimation which our Saviour gives to his disciples of his death's being very nigh, (for it was the very next day) he tells them he is going to heaven; and whither he went, they could not come: that is, not presently; they should follow him their forerunner, afterwards; but at present he had a great deal of work for them to do, though his own work was done; and till they had finished their work, whither he went they could not come.

Learn hence, That though it be rest which the saints may lawfully desire, an everlasting rest with Christ in glory, yet must they not refuse to labour, whilst their Lord will have it so. Till their work be done, whither Christ is gone they cannot come: Ye shall seek me; but whither I go, at present, ye cannot come.