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Lit., "in one piece" or "as one statement" (jumlatan wahidatan) - implying, in the view of the opponents of Islam, that the gradual, step-by-step revelation of the Qur'an points to its having been "composed" by Muhammad to suit his changing personal and political requirements.
I.e., free of all inner contradictions (cf. 4:82 ). See also 39:23 , where the Qur'an is spoken of as "fully consistent within itself". The concise phrase rattalnahu tartilan comprises the parallel concepts of "putting the component parts [of a thing] together and arranging them well" as well as "endowing it with inner consistency". Inasmuch as full consistency and freedom from contradictions in a message spread over twenty-three years of a life as full of movement and drama as that of the Prophet does give a clear indication of its God-inspired quality, it is bound to strengthen the faith of every thinking believer: and herein lies, according to the Qur'an itself, the deepest reason for its slow, gradual revelation. (When applied to the reciting of the Qur'an - as in 73:4 - the term tartil refers to the measured diction and the thoughtful manner in which it ought to be enunciated.)
Three reasons are given for the gradual revelation of the Qur-an. (1) "To strengthen thy heart": the tremendous task of winning the Arab nation, and, through them, the whole world, to Islam, required superhuman patience, constancy, and firmness, and these qualities were strengthened by the gradual promulgation of solutions to each difficulty as it arose. (2) "Slow, well-arranged stages": though the stages were gradual, as the occasion demanded from time to time, in the course of twenty-three years, the whole emerged, when completed, as a well-arranged scheme of spiritual instruction, as we have seen in following the arrangement of the Suras. (3) Questions put and answers given: see next note.