Give yourself fully to your endeavors (Epictetus)

    Tentative efforts lead to tentative outcomes. Therefore, give yourself fully to your endeavors. Decide to construct your character through excellent actions and determine to pay the price of a worthy goal. The trials you encounter will introduce you to your strengths. Remain steadfast and one day you will build something that endures: something worthy of your potential.

--Epictetus      

Image source: Marc Chagall, Joshua, https://www.liveauctioneers.com/item/73568749_marc-chagall-joshua-signed-etching
Quotation source