"Blind spot" is a physiological metaphor for the retinal relation to the optic nerve; in Godelian-physiological terms, we don't experience a blind spot because our brains postulate what ought be present for the retina-optic nerve area, based on nearby retinal neural information. Thus there obtains an area of t-f retinal positing that is unverifiable in the axiomatic system of light-retinal information processing. This is somewhat analogous to undecidable t-f statements in any relatively complex axiomized system (Godel's Incompleteness Theorems).
For "can't see your blindspots", part of the solution is to move your data-gathering, e.g. a scanning "gaze of focus"; this is analogous to finding "known unknowns" in a chemistry class exam.
The "unawareness" or "ignorance is not bliss" shtick is more transcendental: God (or even the next level on Plato's "line of awareness") is foolishness for those whose data gathering remains in the Platonic Eikasia-Pistis-Dianoia levels, each of which cumulatively under-stands prior steps on its Jacobean ladder of data gathering and interpretation, as well as its present plane or plateau (i.e., with plateaus, one believes one has arrived at the top of the ascent, but a plateau may be a Jaspersian surround, or a Buddhistic conditioning, a matrix of maya that conceals the next level up the mountain--this is Plato's great and enduring insight re steps of awareness).
God may be hidden for such dogmatic atheism, but to prove or know the unknown God as I-Thou is comparatively reserved for the Childlike, the pure in heart, the innocent, and the genuinely loving, rather more than for the Dianoia-wise "scribes." "Test the spirits" or the Noesis-claims is quite reasonable advice, e.g. re known unknowns, and also unknown Unknown-Godness, and respect Godel's proof that all sufficiently-axiomized worldly systems have unconfirmable, unfalsifiable, truth-claims ("dark glasses" are they, with respect to total truthness). The way past such Godelian "I Am the Way"-level claims is not per worldly signs and wonders, aka transecting Energy-miracles, or deus ex machina impossibilities within the system's axioms, but a Von Neumannian second-degree reframing, which may be as "simple" as Christ Jesus requesting John Baptist's formal, confirmatory blessing of Jesus' "Lamb of God" Truth-claim.
Mount Analogue by Rene Daumal;
A Thousand Plateaus: Capitalism and Schizophrenia by Deleuze and Guattari (nb that their particular perspective treats individualism as a buddhist/marxian condition of sound-image signifying, aka a temporally-useful matrix that conceptualizes within the form of a sound-image surround, aka marxian determinism; hence the Word and Light as Being of God are therefore deconstructed and reduced to +/- functions of surrounds/conditionings; an example of the general rule that a philosophy rises no higher than its source (philospher-as-signifier));
The Path of the Higher Self;
Beams from Meher Baba;
There's Something about Godel by Franscesco Berto.