Half Done

Dimidium facti qui coepit habet; sapere aude; 

incipe!

He who has begun has half done.  Dare to be wise; begin!

-- Quintus Horatius Flaccus (65 - 8 BC), known in the English-speaking world as Horace, Roman lyric poet during the time of Augustus, Epistles (c. 20 BC and 14 BC) Book I, epistle ii, lines 40–41