The vast majority of human beings dislike and even actually dread all notions with which they are not familiar... Hence it comes about that at their first appearance innovators have generally been persecuted, and always derided as fools and madmen. ↗
In crises, the old is dying and the new has not been born. Hence, the revolts we are witnessing in Egypt and Tunisia, which may yet extend to other countries in the region, are full of uncertainties. ↗
Hence the saying: If you know the enemy and you know yourself, your victory will not stand in doubt; if you now Heaven and you know Earth, you may make your victory complete. ↗
Hence that general is skilful in attack whose opponent does not know what to defend; and he is skilful in defense whose opponent does not know what to attack. ↗