Kondisi jiwa yang kuat di pusaran energi tinggi (power) adalah pondasi utama dalam produktivitas karena manusia akan sulit mencapai produktivitas bila jiwanya rapuh.
Referensi :
Ibn Katsir, Ismail  (774 H) "Tafsir Alquran al-Adziim", Dar Alamiah (QS 2 : 183 - 187)
McCraty, Rollin, et al, "The Coherent Heart: Heart-Brain Interactions, Pyschophysiological Coherence, and the Emergence of System-Wide Order," Integral Review, 5, no. 2, (December 2009): 10--115
Mccraty, Rollin, et al, "The Effects of Emotions on Short-Term Power Spectrum Analysis of Heart Rate Variability," The American Journal of Cardiology, 76, no. 14 (1995): 1089-- 1093, doi:10.1016/s0002-9149(99)80309-9.
Mccraty, Rollin, et al, "The Resonant Heart" Shift: At The Frontiers Of Consciousness December 2004--February 2005
Al Ghazali, Abu Hamid Muhammad, "An Exposition of the Hearts: Makashifat-ul-Quloob (Ihya Ulm al-Dn), Scribe Digital (January 19, 2014)
Hawkins M.D. Ph.D, David R. , "Power vs Force, The Hiddens Determinant of Human Behavior" Hay House Inc. (January 30, 2014)
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