Tao te Ching

30 One who assists the ruler with the principle of Tao, Will not use the force of arms to conquer the world. For such affairs will result in cause and effect. Wherever the armies touch the land, it is turned into a wasteland of thorns and brambles. After a war is fought, bad years are sure to follow. Therefore, one who follows the true nature will understand the principle of cause and effect and shall not rely upon the strength of force. By knowing the effect, thus one will not brag. By knowing the effect, thus one will not boast. By knowing the effect, thus one will not become arrogant. By knowing the effect, although one has no choice, one still abides with the principle of cause and effect and does not resolve into force. When things reach their prime, they start to age and decline. This is the life that is diminishing and shall not reach the ultimate essence.