Avoid Mud

If no waves arise, water will settle of itself;
If no shadow cross it, the mirror will naturally be bright.
    Thus, the heart cannot be made pure, but if you avoid
        muddying elements
    Purity will appear on its own.
    Thus, pleasure should not be sought after, but if you
        avoid things that cause suffering,
Pleasure will exist on it own.

                                          ---Hung Ying-ming---