Ecclesiastes 1:13

And I gave
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my heart
<03820>

to seek
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and search out
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by wisdom
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concerning all [things] that are done
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under heaven
<08064>_:

this sore
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travail
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hath God
<0430>

given
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to the sons
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of man
<0120>

to be exercised
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therewith. {to be...: or, to afflict them}

Ecclesiastes 4:16

[There is] no end
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of all the people
<05971>_,

[even] of all that have been before
<06440>

them: they also that come after
<0314>

shall not rejoice
<08055> (8799)

in him. Surely this also [is] vanity
<01892>

and vexation
<07475>

of spirit
<07307>_.