From a lifetime of reading the one person historically I most resonate with in terms of similar beliefs / understandings is Carl Jung. There are far too many to list so I will just concentrate on one for now.
Throughout my life I have had many spiritual type experiences, usually at times I have felt more grounded e.g. following meditation. From what could be termed supernatural events to an Advaita like experience.
Some of these occurrences have been so powerful I have become concerned that I would become lost to myself and that I would be somehow caught between the worlds. Fortunately this has not happened and I have had the fortune to glimpse other perspectives and return to my human self. Carl Jung describes it very eloquently:
It is under all conditions a most advisable thing to keep to the conscious and rational side, i.e., to maintain that side.
One never should lose sight of it. It is the safeguard without which you would lose yourself on unknown seas.
You would invite illness, indeed, if you should give up your conscious and rational orientation.
On the other hand, it is equally true that life is not only rational.
To a certain extent you have to keep your senses open to the non-rational aspects of
existence. . . .
The unconscious itself is neither tricky nor evil – it is Nature, both beautiful and terrible. . . .
The best way of dealing with the unconscious is the creative way. . . ~Carl Jung, Letters Vol. 1, Pages 108-109.
Jung has said that the unconscious long identified as the oceanic in man, is Nature.
The seeker of himself often feels cast adrift, setting a course between light and dark but ultimately moved along by unseen currents deep within. ~Claire Dunne, Wounded Healer of the Soul, Page 87.