What is John Milton saying in his poem, "How soon hath time?"I want to ask about the meaning of John Milton's poem, "How soon hath time."

John Milton's speaker is reflecting upon his life and
accomplishments through his current age, 23 years old.  He is dissatisfied with what
little he thinks he has produced and bemoans how quickly time is passing.  If the
speaker is the poet, then perhaps he is suggesting that he has produced too few good
poems when he says that "no bud or blossom showeth."  The fact that he references "his
spring" connects to the year of life metaphor where spring is birth and youth, but age
23 is certainly the late end of youth and the clear start of young-adulthood.  He
extends his comments to explain that while the exterior of the person seems old, he has
not matured yet.

The end of the poem talks about how God,
his "great Task-Master" is keeping an eye on the speaker and what he is doing with his
life and the gifts that God has given him.  The speaker hopes that what he accomplishes
will be ultimately pleasing to God.

You can read more about
John Milton on the link below.