Allah says,

﴿وَمَا هُوَ بِقَوْلِ شَيْطَـنٍ رَّجِيمٍ ﴾

(And it is not the word of the outcast Shaytan.) meaning, this Qur'an is not the statement of an outcast Shaytan. This means that he is not able to produce it, nor is it befitting of him to do so. This is as Allah says,

﴿وَمَا تَنَزَّلَتْ بِهِ الشَّيَـطِينُ - وَمَا يَنبَغِى لَهُمْ وَمَا يَسْتَطِيعُونَ - إِنَّهُمْ عَنِ السَّمْعِ لَمَعْزُولُونَ ﴾

(And it is not the Shayatin who have brought it down. Neither would it suit them nor they can. Verily, they have been removed far from hearing it.) (26:210-212) Then Allah says,

﴿فَأيْنَ تَذْهَبُونَ ﴾

(Then where are you going) meaning, where has your reason gone, in rejecting this Qur'an, while it is manifest, clear, and evident that it is the truth from Allah. This is as Abu Bakr As-Siddiq said to the delegation of Bani Hanifah when they came to him as Muslims and he commanded them to recite (something from the Qur'an). So they recited something to him from the so called Qur'an of Musaylimah the Liar, that was total gibberish and terribly poor in style. Thus, Abu Bakr said, "Woe unto you! Where have your senses gone By Allah, this speech did not come from a god.'' Qatadah said,

﴿فَأيْنَ تَذْهَبُونَ ﴾

(Then where are you going) meaning, from the Book of Allah and His obedience. Then Allah says,

﴿إِنْ هُوَ إِلاَّ ذِكْرٌ لِّلْعَـلَمِينَ ﴾

(Verily, this is no less than a Reminder to the creatures.) meaning, this Qur'an is a reminder for all of mankind. They are reminded by it and receive admonition from it.

﴿لِمَن شَآءَ مِنكُمْ أَن يَسْتَقِيمَ ﴾

(To whomsoever among you who wills to walk straight.) meaning, whoever seeks guidance, then he must adhere to this Qur'an, for verily it is his salvation and guidance. There is no guidance in other than it.

﴿وَمَا تَشَآءُونَ إِلاَّ أَن يَشَآءَ اللَّهُ رَبُّ الْعَـلَمِينَ ﴾

(And you cannot will unless (it be) that Allah wills -- the Lord of all that exists.) This means that the will is not left to you all, so that whoever wishes to be guided, then he is guided, and whoever wishes to be astray, then he goes astray, rather, all of this is according to the will of Allah the Exalted, and He is the Lord of all that exists. It is reported from Sulayman bin Musa that when this Ayah was revealed,

﴿لِمَن شَآءَ مِنكُمْ أَن يَسْتَقِيمَ ﴾

(To whomsoever among you who wills to walk straight.) Abu Jahl said, "The matter is up to us. If we wish, we will stand straight, and we do not wish, we will not stand straight.'' So Allah revealed,

﴿وَمَا تَشَآءُونَ إِلاَّ أَن يَشَآءَ اللَّهُ رَبُّ الْعَـلَمِينَ ﴾

(And you cannot will unless (it be) that Allah wills the Lord of the all that exists.) This is the end of the Tafsir of Surat At-Takwir, and all praise and thanks are due to Allah.