Answer:
The best way to serve God is to stop complaining and wait.
Step-by-step explanation:
The works of John Milton had a strong religious content and this is not different from the sonnet sonnet XIX. Milton was blind when he wrote this poem, which is why he questions the reason why God gives him, a useless one because of the blindness) a gift so great. Then, in the sesteto miltom, it conforms to its condition and affirms that the best way to serve God is to stop complaining and waiting.