Similarly in the world of being there exist forces unseen of
the eye, such as the force of ether previously mentioned, that cannot be
sensed, that cannot be seen. However, from the effects it produceth, that is
from its waves and vibrations, light, heat, electricity appear and are made
evident. In like manner is the power of growth, of feeling, of understanding,
of thought, of memory, of imagination and of discernment; all these inner
faculties are unseen of the eye and cannot be sensed, yet all are evident by
the effects they produce.
Now as to the infinite Power that knoweth no limitations;
limitation itself proveth the existence of the unlimited, for the limited is
known through the unlimited, just as weakness itself proveth the existence of
power, ignorance the existence of knowledge, poverty the existence of wealth.
Without wealth there would be no poverty, without knowledge no ignorance,
without light no darkness. Darkness itself is a proof of the existence of light
for darkness is the absence of light.
(‘Abdu’l-Baha, ’Tablet to August Forel’)
