We have a collection of 3 Happiness quotes from Aeschylus
"For the poison of hatred seated near the heart doubles the burden for the one who suffers the disease; he is burdened with his own sorrow, and groans on seeing another's happiness." (ID 54482)
"Happiness is a choice that requires effort at times." (ID 54646)
"And one who is just of his own free will shall not lack for happiness; and he will never come to utter ruin." (ID 54684)