Om Mani Padme Hum - Craig Pruess

The jewel is in the lotus or praise to the jewel in the lotus
It is very good to recite the mantra OM MANI PADME HUM,
but while you are doing it, you should be thinking on its meaning,
for the meaning of the six syllables is great and vast. The first, OM,
is composed of three pure letters, A, U, and M.
These symbolize the practitioner's impure body, speech, and mind;
they also symbolize the pure exalted body, speech and mind of a Buddha.

Can impure body, speech and mind be transformed into pure body,
speech and mind, or are they entirely separate? All Buddhas are cases of being who were like ourselves and then in dependence on the path became enlightened; Buddhism does not assert that there is anyone who from the beginning is free from faults and possesses all good qualities.
The development of pure body, speech, and mind comes from
gradually leaving the impure states and their being transformed into
the pure.

How is this done? The path is indicated by the next four syllables.
MANI, meaning jewel, symbolizes the factor of method- the altruistic
intention to become enlightened, compassion, and love. Just as a
jewel is capable of removing poverty, so the altruistic mind of
enlightenment is capable of removing the poverty, or difficulties, of
cyclic existence and of solitary peace. Similarly, just as a jewel
fulfills the wishes of sentient beings, so the altruistic intention to
become enlightened fulfills the wishes of sentient beings.

The two syllables, PADME, meaning lotus, symbolize wisdom. Just as a lotus grows forth from mud but is not sullied by the faults of mud,so wisdom is capable of putting you in a situation
of non- contradiction where as there would be contradiction if you did not have wisdom. There is wisdom realizing impermanence, wisdom realizing that persons are empty of self-sufficient or substantial existence,wisdom that realizes the emptiness of duality (that is to say, of difference of entity between subject and object), and wisdom that realizes the emptiness of inherent existence. Though there are may different types of wisdom, the main of all these is the wisdom realizing emptiness.

Purity must be achieved by an indivisible unity of method and
wisdom, symbolized by the final syllable, HUM, which indicates
indivisibility. According to the sutra system, this indivisibility of
method and wisdom refers to one consciousness in which there is a full form of both wisdom affected by method and method affected by wisdom.
In the mantra, or tantra vehicle, it refers to one conciousness in
which there is the full form of both wisdom and method as one
undifferentiable entity. In terms of the seed syllables of the five
conqueror Buddhas, HUM is the is the seed syllable of Akshobhya- the immovable, the unfluctuating, that which cannot be disturbed by
anything.

Thus the six syllables, OM MANI PADME HUM, mean that in dependence on the practice which is in indivisible union of method and wisdom,you can transform your impure body, speech and mind into the pure body, speech, and mind of a Buddha. It is said that you should not seek for Buddhahood outside of yourself; the substances for the achievement of Buddhahood are within.
As Maitreya says in his SUBLIME
CONTINUUM OF GREAT VEHICLE (UTTARA TANTRA) all beings naturally have the Buddha nature in their own continuum.
We have within us the seed of purity, the essence of a One Gone Thus (TATHAGATAGARBHA),
that is to be transformed and full developed into Buddhahood.