大乘起信論義疏 1.34

1.34

問曰：真妄相違無相合理，何故言一心？答曰：隨妄義邊終日成妄，而不妨真；全真義邊終日令真，而不妨妄。如柱實法義邊全滅，無有續轉；假名義邊全轉，無有滅義，而不相礙，有為尚在。轉滅二義不相礙妨，何況真心有二義乎！

Question: True and false are mutually contradictory and have no reason to combine; why speak of "one mind"?

Answer: On the side of the meaning of according with the false, it constantly becomes the false without obstructing the true; on the side of the meaning of being completely true, it constantly remains the true without obstructing the false. Just as, on the side of the meaning of the pillar as a real entity, it completely ceases and has no continuous transition; while on the side of the meaning of nominal designation, it completely transitions and has no meaning of cessation, yet they do not obstruct each other. Conditioned things still possess both: the two meanings of transition and cessation do not hinder or obstruct each other; how much more so with the true mind having two meanings!