无源之水，无本之木

Explanation: Source of water; the roots. There is no source of water, a tree without roots. Analogy is not based on things. 　　Source: "Zuo Zhao Gong nine" I'm uncle, Utah clothes and a crown, a primitive wooden water. " 　　Examples: Rational thing so reliable, it is because it comes from the emotional, or rational thing to become ~. ★ Mao Zedong's "On Practice"