If we are to include the outer and the inner struggle in a conception more definite than that of conflict in general, we must employ some such phrase as 'spiritual force.' This will mean whatever forces act in the human spirit, whether good or evil, whether personal passion or impersonal principle; doubts, desires, scruples, ideas-whatever can animate, shake, possess, and drive a man's soul. [19]In a Shakespearean tragedy some such forces are shown in conflict.