August 1

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’)