Because it shut not up ... - That is, because the accursed day and night did not do it. Aben Ezra supposes that God is meant here, and that the complaint of Job is that he did not close his mother’s womb. But the more natural interpretation is to refer it to the Νυχθήμεροι Nuchthēmeroi - the night and the day which he had been cursing, on which he was born. Throughout the description the day and the night are personified, and are spoken of as active in introducing him into the world. He here curses them because they did not wholly prevent his birth.
Nor hid sorrow from mine eyes - By preventing my being born. The meaning is, that he would not have known sorrow if he had then died.