From the White Dharma(1)

There are two forms, two branches in the craft of magic.

First, there is the external form, to grasp the world at its root and shake it. To demand by means of words that the world cannot ignore that which is desired in the secret heart.

This path is perilous but easy.

To beat the drum, to sing the song, to say the words, to inscribe the signs, these are all the simplest of exercises. The world responds to their inherent power. But, the way is perilous. The maker of the ritual must be pure in heart, must be cleansed of intent other than his own. His mind must be focused. His power must be concentrated, and in many cases, there will be changes wrought that were not intended. This is why the path of external magic is fraught with danger. But there will never be few magi who tread it.

Next, there is the internal path, the desire to create changes in oneself. To make the psyche into clay for molding, to make the soul into water for [untranslatable]. It is by this path alone, one may live in harmony with the world and oneself.

This path is sure, but it is hard.

To walk the path, to say only what is needed, to live within a plan, to carry the burdens of the world is the hardest of work. It can be laid aside at a moment's notice. It can be thrown aside with great force as frustrations mount. But, to find that strength within and change a lifetime of habit is the greatest form of magic, and I commend it to any sorcerer or lama willing to study its inherent nature.