Concentrate your effort to see as far out as you can. That is the teaching Milarepa gave to his female disciple, Sahle Aiu. It clearly emphasizes nonduality, nondiscrimination, and no-self. Fifteen minutes a day of meditation on energy. First, think of the outer skin that covers your entire body.
Skin is matter and is therefore a form of energy.
Next, think of your flesh. Flesh is matter and therefore also a form of energy. The bones are also a form of energy. When you first begin this practice, repeat the process several times. You will reach the conclusion that everything in your body, as well as your body as a whole, is energy and nothing else.