8109. 'So as to go by day and by night' means life in both states. This is clear from the meaning of 'going' and 'travelling' as life, dealt with in 3335, 3690, 4882, 5493, 5605; and from the meaning of 'day' as a state of enlightenment and 'night' as a state of dimness, dealt with immediately above in 8106, 8108, thus both states.