"Indeed, this is a reminder," meaning: this surah is a reminder, "so whoever wills may take to his Lord a way," by way of obeying Him.
﴿إِن هَذِه تذكرة﴾ إِنَّ هَذِهِ السُّورَةَ تَذْكِرَةٌ ﴿فَمَنْ شَاءَ اتَّخَذَ إِلَى رَبِّهِ سَبِيلا﴾ بِطَاعَتِهِ