Uplift - What is Consciousness, by Sadhguru.

A Mystic's Perspective. ‘Consciousness’ is a highly abused word, used in many different ways. First of all, let me define what we refer to as consciousness. You are a combination of many things. As a piece of life, as a body, you are a certain amount of earth, water, air, fire, and akash or ether. And there is a fundamental intelligence that puts all these things together in a particular way to make life out of it. The same ingredients that are lying there as mud sit here as life – what an incredible transformation! There is a profound and unimaginable level of intelligence that can make simple things like air into life.

Spiritual Naturalist Society - Atheistic Mysticism, by Eric Steinhart.
Atheists have mystical experiences that don’t involve God. I’ll describe several examples here. Nietzsche had mystical experiences. During early August 1881, at a rock beside Silvaplana Lake, in the Swiss Alps, near Sils Maria, Nietzsche had a mystical experience. Mountain imagery plays an important role in Nietzsche’s thought. Perhaps his mystical experience was aroused by the vastness of the Alps and by reflection on the vastness of eternity.

Psychology Today - Enlightenment: A Controversial Psycho-Spiritual Experience... The state of consciousness all spiritual seekers hope for. And yet wishing for enlightenment is a wonderfully paradoxical experience: craving the state of non-craving, trying for effortlessness.

YouTube - The first part of Rebel Wisdom's exclusive interview with psychologist and professor Jordan Peterson - where he talks in depth about his understanding of mysticism, religion and the challenge of integrating the shadow.