en_tn/ecc/09/09.md

Live happily with the wife whom you love

One should love the wife he has. Alternate translation: "Since you have a wife whom you love, live happily with her" (See: rc://en/ta/man/translate/figs-explicit)

under the sun

This refers to things that are done on earth. See how you translated this in Ecclesiastes 1:3. Alternate translation: "on the earth" (See: rc://en/ta/man/translate/figs-idiom)

your days

"your lifetime"

That is your reward

The word "that" refers to living happily with his wife.