8 But those rulers, having heard the assurance of the multitude, and that murmuring noise of the people in which Christ was being glorified, “sent officers to take Him.” To take whom? Him not yet willing to be taken. Because then they could not take Him while He would not, they were sent to hear Him teaching. Teaching what? “Then said Jesus, Yet a little while I am with you.” What ye wish to do now ye will do, but not just now; because I am not just now willing. Why am I now as yet unwilling? Because “yet a little while I am with you; and then I go unto Him that sent me.” I must complete my dispensation, and in this manner come to my suffering.
Source: Tractates on the Gospel of John (New Advent)