Here "voice" represents the words that are spoken. AT: "my words are for the sons of mankind" (See: [[rc://en/ta/man/translate/figs-metonymy]])
# the sons of mankind
This is metonymy representing all human beings. AT: "all people" (See: [[rc://en/ta/man/translate/figs-metonymy]])
# naive
"inexperienced, immature"
# learn wisdom
The abstract word "wisdom' refers to what a wise person believes and to the way in which he acts. AT: "learn how a wise person acts" or "learn what it means to be wise" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])