Water is the softest thing, yet it can penetrate mountains and earth. This shows clearly the principle of softness overcoming hardness.
水天下莫柔弱于水，而攻坚强者莫之能胜，以其无以易之。
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Water
水天下莫柔弱于水，而攻坚强者莫之能胜，以其无以易之。