The Noble Maitreya's Aspiration Prayer འཕགས་པ་བྱམས་པའི་སྨོན་ལམ།

Wonderful meditation instruction based on the prayer's verse 13 on realizing emptiness, first in accordance with the rangtong schools focusing on emptiness like space and then the emptiness that is free of all fabrication.
Why it is possible to prove and therefore realize emptiness: no arising from the 4 possibilities. How we "drag" past suffering along. Examination of coming, going, walking. Verse on realizing dharmadhatu. Three Kinds of Confidence.