Allah says,

[إِنَّ هَـذِهِ]

(Verily, this) meaning, this Surah.

[تَذْكِرَةٌ]

(an admonition,) meaning, men of understanding receive admonition from it. Thus, Allah says,

[فَمَن شَآءَ اتَّخَذَ إِلَى رَبِّهِ سَبِيلاً]

(therefore whosoever wills, let him take a path to His Lord.) meaning, from those whom Allah wills that they be guided. This is similar to the stipulation that Allah mentions in another Surah,

[وَمَا تَشَآءُونَ إِلاَّ أَن يَشَآءَ اللَّهُ إِنَّ اللَّهَ كَانَ عَلِيماً حَكِيماً ]

(But you cannot will, unless Allah wills. Verily Allah is Ever All-Knowing, Al-Wise.) (76:30)