"We cannot grasp the true meaning of the divine holiness by thinking of someone or something very pure and then raising the concept to the highest degree we are capable of.  God's holiness is not simply the best we know infinitely bettered.  We know nothing like the divine holiness.  It stands apart, unique, unapproachable, incomprehensible and unattainable.  The natural man is blind to it.  He may fear God's power and admire His wisdom, but His holiness he cannot even imagine." 

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[A.W. Tozer]