13 I applied my mind to study and to explore by wisdom all that is done under the heavens.(A) What a heavy burden God has laid on mankind!(B)

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13 And I gave my heart to seek and search out by wisdom concerning all things that are done under heaven: this sore travail hath God given to the sons of man to be exercised therewith.

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25 So I turned my mind to understand,
    to investigate and to search out wisdom and the scheme of things(A)
and to understand the stupidity of wickedness
    and the madness of folly.(B)

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25 I applied mine heart to know, and to search, and to seek out wisdom, and the reason of things, and to know the wickedness of folly, even of foolishness and madness:

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