Before turn in this poem is very sad. The message being given to the reader was to not mourn over the writers death and know that they are free and ok. Even though that he will be forgotten, he wants you to be strong and he supports you and will watch over you. It takes a sad but humble turn with the line "But let your love even with my life decay". This line alone creates such a sad mood. Essentially the line is saying to let your love for him decay just like his body for when he did. But after this turn the poem gets very humble and thoughtful in a way that would make you cry.
Hey do you want to come to our remembrance party for Shakespeare
Yeah! I'm down for that. What time?
This line is referring to reader to again not to grieve over him and to continue living life knowing that that the writer is forgotten.
Lest the wise world should look into your moan
Shakespeare is basically on the readers side and is worried more abt them than himself. This poem had a sad mood through out but taught people to cope with deaths of others and turn sad things around for the better knowing that they are being watched and cared for in the afterlife.