Dear Sacredstar,
in Eastern Buddhism, the use of the term "Heart" signifies more than what is associated with it in Christian terminology. The Chinese/Japanese character "Shin" for "Heart" also means "Mind", so usually translators will pick one of translate it as "Heart/Mind".
Perhaps one of the most striking terms in Buddhism concerning "heart-to-heart" is
Isshin denshin, a direct communication from the spirit of the teacher to that of the student.
One of the central texts in Easter Buddhism is the Heart Sutra, a summary text concentrating the main principles of the Mahayana Teachings. Incidentally, the Japanese word for Sutra, "Shingyo", contains the "Heart Character as well.
[size=+3]Heart Sutra
[/size][size=+1](Hannya shingyô)
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[font=Times, Helvetica, sans-serif]Avalokiteshvara Bodhisattva, when deeply practicing prajna paramita, clearly saw that all five aggregates are empty and thus relieved all suffering. Shariputra, form does not differ from emptiness, emptiness does not differ from form. Form itself is emptiness, emptiness itself form. Sensations, perceptions, formations, and consciousness are also like this. Shariputra, all dharmas are marked by emptiness; they neither arise nor cease, are neither defiled nor pure, neither increase nor decrease. Therefore, given emptiness, there is no form, no sensation, no perception, no formation, no consciousness; no eyes, no ears, no nose, no tongue, no body, no mind; no sight, no sound, no smell, no taste, no touch, no object of mind; no realm of sight... no realm of mind consciousness. There is neither ignorance nor extinction of ignorance... neither old age and death, nor extinction of old age and death; no suffering, no cause, no cessation, no path; no knowledge and no attainment. With nothing to attain, a bodhisattva relies on prajna paramita, and thus the mind is without hindrance. Without hindrance, there is no fear. Far beyond all inverted views, one realizes nirvana. All buddhas of past, present, and future rely on prajna paramita and thereby attain unsurpassed, complete, perfect enlightenment. Therefore, know the prajna paramita as the great miraculous mantra, the great bright mantra, the supreme mantra, the incomparable mantra, which removes all suffering and is true, not false. Therefore we proclaim the prajna paramita mantra, the mantra that says: "Gate Gate Paragate Parasamgate Bodhi Svaha."[/font]