Fearlessness and Fearfulness two sides of the same coin

When a man has learned within his heart what fear and trembling mean, he is safeguarded against any terror produced by outside influences. Let the thunder roll and spread terror a hundred miles around: he remains so composed and reverent in spirit that the sacrificial rite is not interrupted. This is the spirit that must animate leaders and rulers of men - a profound inner seriousness from which all outer terrors glance off harmlessly 
THE I CHING, China, Circa Eighth century B.C.