In this poem Milton seems to be concerned that in his blindness he is not capable of serving God well.  When he says “talent which is death to hide” he is referring to Jesus’ parable that God judges those who hide their talents. Milton comes to the realization that even if we seem dormant to other humans we can still give as much glory to God as someone who is more able to serve him. Furthermore, Milton concludes that God understands our infirmities and our limitations.