Spiritual feelings are often associated with awe and the word ‘transcendent’
After being born, at the crucial stages of the development of our being, we are left in a stage of utmost dependency. We own nothing, we are helpless, and the world is full of obvious but unnatainable meaning. At this stage, every growing human needs the percievable world to be fairly well-intended to even survive through infancy, let alone thrive. So evolution hardwired us to seek bonding with our caretakers. That wiring manifests in the form of an intense feeling of fullfillment when we reaffirm or strengthen that bond.
I suspect that transcendence and spiritual awe are more common with people who feel helpless in their life, as an attempt to recreate that feeling of being helped and supported by a powerful entity beyond understanding. Monotheistic spirituality, with the figure of the loving father-god, goes as far as to explicitly state that the believer should forgo understanding and be a helpless child in the hand of the benevolent god.