Ecclesiastes 8:15-17

WEB_Strongs(i)
  15 H7623 Then I commended H8057 mirth, H120 because a man H2896 has no better thing H8121 under the sun, H398 than to eat, H8354 and to drink, H8055 and to be joyful: H3867 for that will accompany H5999 him in his labor H3117 all the days H2416 of his life H430 which God H5414 has given H8121 him under the sun.
  16 H5414 When I applied H3820 my heart H3045 to know H2451 wisdom, H7200 and to see H6045 the business H6213 that is done H776 on the earth H3117 (for also there is that neither day H3915 nor night H7200 sees H8142 sleep H5869 with his eyes),
  17 H7200 then I saw H4639 all the work H430 of God, H120 that man H3201 can't H4672 find out H4639 the work H6213 that is done H8121 under the sun, H834 because H7945 however H120 much a man H5998 labors H1245 to seek it out, H4672 yet he won't find H2450 it. Yes even though a wise H559 man thinks H3045 he can comprehend H3201 it, he won't be able H4672 to find it.