Psalms 42:3

‘My tears have been my food day and night,

While they continually say to me,

Where is your God?'

Indeed so powerful are his feelings that he describes himself as weeping day and night so as to satisfy his emotional state, because his enemies taunt him continually about the fact that God does not help him (compare Psalms 42:10). His desire to join in worship with God's people was so great that he could not stop thinking about it, and weeping over his loss. Reference to the words of his captors may suggest that even in his present condition he had been testifying about the greatness and splendour of his God. It may also indicate that he was being kept short of food. His tears were his food.