The Hart Sutra

Avalokitesvara Bodhisattva
when practicing deeply the Prajna Paramita
perceives that all five skandhas are empty
and is saved from all suffering and distress.

Shariputra,form does not differ from emptiness,
emptiness does not differ from form.
That which is form is emptiness,
that which is emptiness form.

The same is true of feelings,
perceptions, impulses, consciousness.

Shariputra,
all dharmas are marked with emptiness;
they do not appear or disappear,
are not tainted or pure,
do not increase or decrease.

Therefore, in emptiness no form, no feelings,
perceptions, impulses, consciousness.
No eyes, no ears, no nose, no tongue, no body, no mind;
no color, no sound, no smell, no taste, no touch,
no object of mind;
no realm of eyes
and so forth until no realm of mind consciousness.

No ignorance and also no extinction of it,
and so forth until no old age and death
and also no extinction of them.
No suffering, no origination,
no stopping, no path, no cognition,
also no attainment with nothing to attain.

The Bodhisattva depends on Prajna Paramita
and the mind is no hindrance;
without any hindrance no fears exist.
Far apart from every perverted view one dwells in Nirvana.

In the three worldsall Buddhas depend on Prajna Paramita
and attain Anuttara Samyak Sambodhi.

Therefore know that Prajna Paramita
is the great transcendent mantra,
is the great bright mantra,
is the utmost mantra,
is the supreme mantra which is able to relieve all suffering
and is true, not false.

So proclaim the Prajna Paramita mantra,
proclaim the mantra which says:
gate gate paragate parasamgate bodhi svaha
gate gate paragate parasamgate bodhi svaha
gate gate paragate parasamgate bodhi svaha.

The Hart Sutra
The Heart Sutra is regarded as the summation of the wisdom of the Buddha. It expresses the insight attained by non-attachment and the doctrine of emptiness. The Heart Sutra is said to be the shortest and the most popular sutra in Buddhism. The Diamond Sutra in about 5000 words summarizes the six hundred volumes of the Maha Prajna Sutra, and the Heart Sutra in around 250 words summarizes the Diamond Sutra. There are many translations of the Heart Sutra and this one was for me the easiest to learn, (even though it may not be an accurate translation from the Sanskrit). There are many commentaries on the Heart Sutra, the following translation is one I found in Wikipedia (http://en.wikipedia.org/wiki/Heart_Sutra)

The Heart Sutra introduces the bodhisattva of compassion, Avalokiteśvara, who in this case is representing the faculty of prajña (wisdom). His analysis of phenomena is that there is nothing which lies outside the five aggregates of human existence (skandhas) — form (rūpa), feeling (vedanā), volitions (samskārā), perceptions (saṁjñā), and consciousness (vijñāna).
Avalokiteśvara then addresses Śariputra, who in this text — as with many other Mahāyāna texts — is a representative of the Early Buddhist schools, described in many other sutras as being the Buddha's foremost disciple in wisdom. Avalokiteśvara famously states that, "form is emptiness (Śūnyatā) and emptiness is form" and declares the other skandhas to be equally empty — that is, without an independent essence. Avalokiteśvara then goes through some of the most fundamental Buddhist teachings such as the Four Noble Truths and explains that in emptiness none of these labels apply. This is traditionally interpreted as saying that Buddhist teachings, while accurate descriptions of conventional truth, are mere statements about reality — they are not reality itself — and that they are therefore not applicable to the ultimate truth that is by definition beyond dualistic description. Thus the bodhisattva, as the archetypal Mahāyāna Buddhist, relies on the perfection of wisdom, defined in the larger Perfection of Wisdom sutras to be the wisdom that perceives reality directly without conceptual attachment. This perfection of wisdom is condensed in the mantra with which the Sutra concludes.