大乘百法明門論解 1.34

1.34

言心所有法者，具三義故：一、恒依心起；二、與心相應；三、繫屬於心。具此三義，名為心所故；要心為依，方得起故；觸等恒與心相應故。既云與心相應，蓋心不與心自相應故；心非心所故；他性相應，非自性故。

Speaking of caitasika-dharmas, they possess three characteristics: first, always arising reliant upon citta; second, being associated with citta; third, being bound to citta. Possessing these three characteristics, they are named caitasikas; for they must rely on citta as their support before they can arise; contact and the rest are always associated with citta. Since it is said that they are associated with citta, it is because citta is not associated with citta itself; citta is not a caitasika; there is association with an other nature, not with one's own nature.