This didn't really answer fully the question the information you provided I just wanted you to know that he does disprove slavery by works of men
final scripture:
Ecclesiastes 8:9- All this I have seen, and there was an applying* of my heart to every work that has been done under the sun, [during] the time that man has dominated man to his injury
*âEUoeThere was an applying.âEU( In Heb. this is a verb in the infinitive absolute, indefinite as to time and impersonal)
EDIT:
*"There was an applying"( In Heb. this is a verb in the infinitive absolute, indefinite as to time and impersonal)
fixed that lol