Usage examples for equation
Now in the case of an observation on the mental plane this personal equation would not appreciably affect the impressions received, for since each would thoroughly grasp the entire subject it would be impossible for him to see its parts out of due proportion; but, except in the case of carefully trained and experienced persons, this factor does come into play in transferring the impressions to the lower planes. – Clairvoyance by Charles Webster Leadbeater
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