Set of four virtues

"Marcus organized his practice into a set of four virtues which he never stopped practicing. Wisdom—learn what is good and bad, which involvements are beneficial and which are damaging, which concerns are ennobling and which are degrading. Justice—exercise honesty and fairness so that you can always respect yourself; do not be arrogant, thinking you are more than you are; but do not think less of yourself either, thinking you are worth nothing. Fortitude—develop the strength to withstand courageously “the slings and arrows of outrageous fortune,” as Shakespeare later phrased it. And temperance—develop control of one’s passions, resist excesses, and learn to strike a balance in all of life."