The common practices are the four thoughts that turn the mind away from samsara. The uncommon practices are taking refuge, generating bodhichitta, purifying obscurations and gathering the accumulations of merit and wisdom. Exert yourself according to each of their commentaries until experiences arise. Especially, embrace guru yoga as the vital essence of practice, and practice diligently. If you do not, your meditation will grow slowly, and even if it grows a little, obstacles will arise and genuine realization will not manifest in your mindstream. Therefore, forcefully pray with uncontrived devotion. At some time the realization of wisdom mind will be transmitted to your mindstream, and an extraordinary realization that can not be expressed by words will definitely arise from within yourself.
As it has been said by Lama Shang Rinpoche:
To nurture stillness,
To nurture spiritual experiences,
To nurture samadhi and other spiritual states-
These are common.
But by the strength of your devotion,
For realization to arise from within
Due to the lama’s blessings-
This is rare.
Therefore, for the ultimate truth of the Great Perfection to appear in your mind is dependent upon the preliminary practices. This is what Drigungpa meant when he said:
Other spiritual teachings regard the main practice as being profound.
We regard the preliminary practice as being profound.
It is just as he said.