Authors:

There's no better sign of a brave mind than a hard hand.

William Shakespeare, Warne Routledge (and Routledge (Londres)), William Hazlitt (1864). “The Dramatic Works of William Shakspeare: From the Text of Johnson, Stevens, and Reed with Glossarial Notes, Life &c. : in Four Volumes”, p.149
There's no better sign of a brave mind than a hard hand.