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Inasmuch as awareness of the existence of God is here postulated as a prerequisite of a full understanding of the Qur'anic parables (and, by implication, allegories as well), the above verse should be read side by side with the statement that the Qur'an is meant to be "a guidance for all the God-conscious, who believe in [the existence of] a reality which is beyond the reach of human perception" (see {2:2-3} and the corresponding note [3]).
Parables seem simple things, but their profound meaning and application can only be understood by those who seek knowledge and by Allah's grace attain it.