Natur seldum makes a phool, she simply furnishes the raw materials, and lets the fellow finish the job to suit himself.

[Nature seldom makes a fool, she simply furnishes the raw materials and lets the fellow finish the job to suit himself.]

Josh Billings (1818-1885) American humorist, aphorist [pseud. of Henry Wheeler Shaw]

Josh Billings’ Trump Kards, ch. 11 “The Mermaid” (1874)
    (Source)

See also Billings.