Tweet Ignorance, the root and stem of all evil. Quote by Plato. You May Also Like...There is only one good, knowledge, and one evil, ignorance.Be kind, everyone you meet is fighting a hard battle.Think good, and good follows. Think evil, and evil follows. You are what you think all day long.Thinking is the talking of the soul with itself.There are two things a person should never be angry at, what they can help, and what they cannot.We are twice armed if we fight with faith.Good actions give strength to ourselves and inspire good actions in others.For a man to conquer himself is the first and noblest of all victories.Never discourage anyone who continually makes progress, no matter how slow.