It is the light of the intellect which gives us knowledge
and understanding, and without this light the physical eyes would be useless.
This light of the intellect is the highest light that exists, for it is born of
the Light Divine. The light of the intellect enables us to understand and
realize all that exists, but it is only the Divine Light that can give us sight
for the invisible things, and which enables us to see truths that will only be
visible to the world thousands of years hence.
- ‘Abdu’l-Baha (From a talk,
Paris, November 5, 1911, ‘Paris Talks’)