He sought useful words, and he wrote most righteous words, which were full of truth
Other versions
King James Version
The preacher sought to find out acceptable words: and that which was written was upright, even words of truth. English Standard Version
The Preacher sought to find words of delight, and uprightly he wrote words of truth.New International Version
The Teacher searched to find just the right words, and what he wrote was upright and true.