Infinite and eternal vision has its source in God, divine Principle. On page 586 of "Science and Health with Key to the Scriptures" Mary Baker Eddy defines "eyes" as follows: "Spiritual discernment, —not material but mental." She continues, "Jesus said, thinking of the outward vision, 'Having eyes, see ye not?' (Mark viii. 18.)
Spiritual discernment enables us to distinguish between the false and the true. Through the understanding of infinite, eternal, and all-seeing Mind, we recognize the illusory nature of the concepts of mortal mind which appear to the material eye, and we apprehend spiritual reality. Spiritual insight is found in the pure and humble consciousness, which intuitively detects the falsity of the limitations of a personal, mortal sense of existence.
The Psalmist sang (Ps. 119:18), "Open thou mine eyes, that I may behold wondrous things out of thy law." It is plain that the Psalmist was asking for spiritual, not material, vision. Mrs. Eddy makes it clear that humility is needed in order that our eyes may be opened and that we may be endowed with the infinite and eternal vision which perceives the wonders of God's creation as spiritual and inviolable. She says (Miscellaneous Writings, p. 356), "Humility is lens and prism to the understanding of Mind-healing."