KJV : Then I beheld <07200> (8804) all the work <04639> of God <0430>, that a man <0120> cannot <03201> (8799) find out <04672> (8800) the work <04639> that is done <06213> (8738) under the sun <08121>: because <0834> though <07945> a man <0120> labour <05998> (8799) to seek [it] out <01245> (8763), yet he shall not find <04672> (8799) [it]; yea further; though a wise <02450> [man] think <0559> (8799) to know <03045> (8800) [it], yet shall he not be able <03201> (8799) to find <04672> (8800) [it].

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NASB : and I saw every work of God, \i1 I concluded\i0 that man cannot discover the work which has been done under the sun. Even though man should seek laboriously, he will not discover; and though the wise man should say, "I know," he cannot discover.

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NASB# : and I saw<7200> every<3605> work<4639> of God<430>, <I>I concluded</I> that man<120> cannot<3201><3808> discover<4672> the work<4639> which<834> has been done<6213> under<8478> the sun<8121>. Even though<7945><834> man<120> should seek<1245> laboriously<5998>, he will not discover<4672>; and though<518> the wise<2450> man<2450> should say<559>, "I know<3045>," he cannot<3201><3808> discover<4672>.