The Game of Life (and How to Play It) by Florence Scovel Shinn

Most people consider life a battle, but it is not a battle, it is a game. It is a game, however, which cannot be played successfully without the knowledge of spiritual law, and the Old and the New Testaments give the rules of the game with wonderful clearness. Jesus the Christ taught that it was a great game of Giving and Receiving. If we give hate, we will receive hate; if we give love, we will receive love; if we give criticism, we will receive criticism; if we lie we will be lied to; if we cheat we will be cheated. We are taught also, that the imaging faculty plays a leading part in the game of life. Keep thy heart (or imagination) with all diligence, for out of it are the issues of life." (Prov. 4:23.)