Sonnet III belongs to the socalled Marriage Sonnets written by Shakespeare.

He is talking to a young man: this is very significant because sonnets were generally composed for women. This is a relevant innovation.

In the first quatrain the speaking voice invites a young man to understand his beauty, to have children and to bless a mother.

In the second quatrain the speaking voice makes two questions to convince and persuade the young man to marry a woman and to have children so that he can guarantee posterity.

In the third quatrain Shakespeare refers particulary to time. He shows April as "lovely" because in spring nature reborns and this is the right period to have children. Shakespeare underlines the importance of time ("golden time" because of his youth) because the problem is that time passes. The young man can't stop because there is not enough time in life.

In the last two lines, that is the final couplet, the speaking voice repeats the concept with few words. Shakespeare invites again the young man not to die single and not to make his beauty die with him.