Enlightenment

Enlightenment in a secular context often means the "full comprehension of a situation", but in spiritual terms the word alludes to a spiritual revelation or deep insight into the meaning and purpose of all things, communication with or understanding of the mind of God, profound spiritual understanding or a fundamentally changed consciousness whereby everything is perceived as a unity.
Some scientists believe that during meditative states leading up to the subjective experience of enlightenment there are actual physical changes in the brain.

According to Mandukya Upanishad, "enlightenment is a state of freedom from the ignorance that causes suffering. There is no necessity to attain mere belief in God, but it is necessary to have profound knowledge of the truth which lies behind the concept of the word God. The idea is not to know God as a different being but to know one's own real self and its essential nature, which is the self of all. The preachings of religion make a person dependent on priests,temples, idols, blind faith and dogma and dependence on these is a habit of the lower mind. Such crutches may be useful at a certain stage for some people, but they do not lead one to ultimate truth. A dependent mind is not free, and without freedom, enlightenment is impossible. Religious dogmas are full of beliefs and myths that do not satisfy the human intellect and that bind believers to a narrow view of life and human potential. Such preachings instill more fear than love in the hearts of masses" reference: enlightenment without god.

^{Source: Wikipedia}