Perspicacity
Encyclopedia
Perspicacity is a penetrating discernment - a clarity of vision
Visionary
Defined broadly, a visionary, is one who can envision the future. For some groups this can involve the supernatural or drugs.The visionary state is achieved via meditation, drugs, lucid dreams, daydreams, or art. One example is Hildegard of Bingen, a 12th century artist/visionary and Catholic saint...

 or intellect
Intellect
Intellect is a term used in studies of the human mind, and refers to the ability of the mind to come to correct conclusions about what is true or real, and about how to solve problems...

which provides a deep understanding and insight.

Being perspicacious about other people, rather than having false illusions, is a sign of good mental health.
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