As he drew near, he gazed upon the gate Ne'er to be entered more by him or Sin, With such a glance of supernatural hate, As made Saint Peter wish himself within; He pattered with his keys at a great rate, And sweated through his apostolic skin: Of course his perspiration was but ichor, Or some such other spiritual liquor.

-Rochdale
  The Vision of  Judgement, stanza 25.

Genius is one per cent inspiration, ninety-nine per cent perspiration.

-Edison,Thomas Alva
c.1903  Quoted in Harper's Monthly Magazine, Sep1932.