Divine Guidance

I am a university student and one of my male classmates is an atheist. Now that this has come to my notice, is it my duty to guide him? Zoheir Ali Esmail	When I am asking Allah (swt) for guidance I often see a Surah that seems to be the answer. Is this consistent with Islamic teachings or just a reflection of my Western upbringing and the tendency to personalize? Sayyed Mohammad Al-Musawi
Why does the Quran state that Allah guides whom He wants and not others? Why is He gracious towards some but not others? Why does He not help the misguided by opening their eyes? Sayyed Mohammad Al-Musawi	What does Allah (swt) mean in the verse where it says that "those who strive hard for Us, We will guide them in our ways"? Zoheir Ali Esmail