Yes, it is the Holy Koran since it is the final message from God(Allah). Please read that and I am sure that you will get tranquility. Look what this "Quote from the Holy Quran (2 - 2)
ذلك الكتاب لا ريب ۛ فيه ۛ هدى للمتقين
Thalika alkitabu la rayba feehi hudan lilmuttaqeena
This is the Book (the Quran), whereof there is no doubt, a guidance to those who are Al-Muttaqun [the pious and righteous persons who fear Allah much (abstain from all kinds of sins and evil deeds which He has forbidden) and love Allah much (perform all kinds of good deeds which He has ordained)].Quote from the Holy Quran (2 - 3)
الذين يؤمنون بالغيب ويقيمون الصلاة ومما رزقناهم ينفقون
Allatheena yuminoona bialghaybi wayuqeemoona alssalata wamimma razaqnahum yunfiqoona
Who believe in the Ghaib and perform As-Salat (Iqamat-as-Salat), and spend out of what we have provided for them [i.e. give Zakat, spend on themselves, their parents, their children, their wives, etc., and also give charity to the poor and also in Allah's Cause ]. Quote from the Holy Quran (2 - 4)
والذين يؤمنون بما أنزل إليك وما أنزل من قبلك وبالآخرة هم يوقنون
Waallatheena yuminoona bima onzila ilayka wama onzila min qablika wabialakhirati hum yooqinoona
And who believe in (the Quran and the Sunnah) which has been sent down (revealed) to you (Muhammad Peace be upon him) and in [the Taurat (Torah) and the Injeel (Gospel), etc.] which were sent down before you and they believe with certainty in the Hereafter. (Resurrection, recompense of their good and bad deeds, Paradise and Hell, etc.).
Quote from the Holy Quran (2 - 5)
أولئك على هدى من ربهم ۖ وأولئك هم المفلحون
Olaika AAala hudan min rabbihim waolaika humu almuflihoona
They are on (true) guidance from their Lord, and they are the successful.
First part is Arabic, original words from Quran or Koran. Second part is how to pronounce. The last is translation in English. If you need help let me know.