I am afraid that the schools will prove the very gates of hell, unless they diligently labor in explaining the Holy Scriptures and engraving them in the heart of the youth.
Martin Luther
Diligence is the mother of good fortune, and idleness, its opposite, never brought a man to the goal of any of his best wishes.
Miguel de Cervantes
What we hope ever to do with ease, we must learn first to do with diligence.
Samuel Johnson
Leisure is the time for doing something useful. This leisure the diligent person will obtain the lazy one never.
Benjamin Franklin