The theory of probabilities is at bottom nothing but common sense reduced to calculus.

Loneliness is the poverty of self; solitude is the richness of self.

出自汉·桓宽《盐铁论·险固》。这句话以“地利”与“人和”、“武力”与“文德”的对比，阐明了实行仁政对于治国安邦的重要性。