大乘起信論略述 2.222

2.222

[Treatise:] One should contemplate that the past [... suddenly arises]. [Exposition:] This contemplates non-self to remove the inversion of self. "The past is like a dream" because what is already perished is difficult to pursue. "The present is like lightning" because it does not abide for an instant. "The future is like clouds" because impermanence suddenly arises. By contemplating that the three times have no self-nature, one can distance the mark of self; therefore it removes the inversion of self.