John Wesley on Ecclesiastes 1:3

What profit - What real and abiding benefit? None at all. All is unprofitable as to the attainment of that happiness which all men are enquiring after. His labour - Heb. his toilsome labour, both of body and mind in the pursuit of riches, or pleasures, or other earthly things. Under the sun - In all worldly matters, which are usually transacted in the day time, or by the light of the sun. By this restriction he implies that the happiness which in vain is sought for in this lower world, is really to be found in heavenly places and things.