[Meditative·Serenity] 依照经论认识止观的体性（五）

Thus, meditative serenity and insight are not differentiated in terms of their respective objects of meditation,
for there is meditative serenity that knows emptiness and there is insight which does not know emptiness.

Also, meditative serenity (zhignas) is your mind quieting (zhi) movement toward external objects,
and then abiding (gnas) on an internal object of meditation;
insight (Ihag mthong) is superior (lhag pa), i.e., special, seeing (mthong).

Lamrim Chenmo Vol.3 Pg18LL06-LL13