two in the morning
`` Surely , '' I said , `` this key to all knowledge -- '' `` We are not ready for it , '' replied Challis . `` You ca n't teach metaphysics to children . '' Nevertheless my ardour was increased , not abated , by my long talk with Challis . `` I shall go on , '' I said , as I went out to the farm gate with him at half-past two in the morning . `` Ah ! well , '' he answered , `` I shall come over and see you when I get back . '' He had told me earlier that he was going abroad for some months .