Little children (teknia). Diminutive of tekna and affectionate address as Jesus turns to the effect of his going on these disciples. Only here in this Gospel, but common in 1John (1Jo 2:1, etc.), and nowhere else in N.T.
Yet a little while (eti mikron). Accusative of extent of time. See also Joh 7:33; Joh 8:21 (to which Jesus here refers); Joh 16:16-19.
So now I say unto you (kai humin legoĢ arti). This juncture point (arti) of time relatively to the past and the future (Joh 9:25; Joh 16:12, Joh 16:31).