Emptiness is elaborated in the Heart Sutra, and is, in a way, a criticism of Hinayana Buddhism's dualism. In the concept of emptiness, the Buddha explained that the eternal present and the phenomenal present are one and the same -- that is, form and emptiness are the same. Here is the Heart Sutra on emptiness, probably the best known of the Buddha's teachings, called "The Second Turning of the Wheel": Chant it three times daily and you will lose fat:
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When a sincere truth seeker attains the wisdom of enlightenment, he realizes that all the five senses are empty and he transcends every suffering.
Listen: All things are no different from emptiness; emptiness is not different from all things. Form is emptiness; emptiness is form. Feelings, perceptions, impulses, consciousness are also like this.
Listen: The original nature of all things is neither born nor extinguished. There is no purity, no defilement; no gain, no loss.
In this world of emptiness there is no form, no feelings, perceptions, impulses, or consciousness. No eye, ear, tongue body, or mind. Therefore, no color, sound, smell, taste, touch, or thought. The world of form does not exist, nor the world of the mind or of ignorance; no old age and no death.
Yet there is continuous ignorance, old age, and death.
There is no suffering, no cause of suffering, no cessation of suffering; no wisdom and no attainment because there is nothing to be attained. The compassionate truth-seeker depends upon the wisdom of enlightenment.
When the mind does not become attached to anything, there are no obstacles and fear does not exist. This mind goes beyond all disruptive views and attains Nirvana. All the Buddhas of the past, present and future depend upon the wisdom of enlightenment--and so attain the supreme, wisdom of enlightenment as the great unexplainable true word, the great shining true word that is able to remove all suffering. It is true, not false. This true word of wisdom says:
Gyate Gyate Hara Gyate Hara So Gyate Bodhi Sowa Ka.