Today's Stichomancy for Leonardo da Vinci

The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Lamentable Tragedy of Locrine and Mucedorus by William Shakespeare:

Dan, dan, dan, dan.

STRUMBO. Most happy men we Cobblers be:

ALL. Dan diddle dan.

TROMPART. The can stands full of nappy ale:

ALL. Dan, dan, dan, dan.

STRUMBO. In our shop still withouten fail: