The theme of heart is closely connected to the following concepts:
energy, energetics, vitality, etheric body,
spirituality, psychology, healing, medicine, science,
ecology, planet, economy...
This site publishes compilations of extracts from spiritual teachings:
Agni Yoga series (Elena Roerich, inspired by the Master Morya),
books by Alice Bailey, inspired by the Master Djwal Khul (DK),
writtings by Michel Bercot, by Charles-Rafaël Payeur...