To Strengthen the Weak & Purify the Strong
"... in the natural man, the symbols are unbalanced in strength - some being weaker and some stronger. The effect of the Ceremony is to strengthen the weak, to purify the strong, and so begin to equilibriate them and at the same time make a link between them and the corresponding forces of the Macrocosm." - Z3, The Symbolism of the Admission of the Candidate