Guidance Is From Allah Alone

فَإِنَّ اللَّهَ يُضِلُّ مَنْ يَشَاءُ وَيَهْدِي مَنْ يَشَاءُ

"Verily, Allah sends astray whom He wills, and guides whom He wills." [Faatir, 35:8]

Allah has created man and given him reason, and He has sent down to him Revelation and sent to him Messengers to call him to the truth and warn him against falsehood. Then He has left him to make his own choice. Allah commanded His Messenger Muhammad (peace and blessings of Allaah be upon him) to convey the truth to all of mankind. Then they have the choice to do as they wish. If a person obeys, he benefits himself, and if he disobeys, he harms himself.

Allaah says:

“Say: ‘O you mankind! Now truth (i.e. the Qur’aan and Prophet Muhammad), has come to you from your Lord. So whosoever receives guidance, he does so for the good of his own self; and whosoever goes astray, he does so to his own loss; and I am not (set) over you as a Wakeel (disposer of affairs to oblige you for guidance)’”[Yoonus 10:108] 

Guidance is in the hand of Allah. If Allah willed, He could guide all of mankind, for there is nothing that He cannot do on this earth or in the heavens. Nothing happens in His Dominion except that which He wills. 

But in His Wisdom, Allah has created us with the ability to choose, and He has sent down to us guidance and the Criterion, the Qur'an. So whoever obeys Allah and His Messenger will enter Paradise and whoever disobeys Allah and His Messenger will enter Hell, as Allah says:

“Verily, proofs have come to you from your Lord, so whosoever sees, will do so for (the good of) his ownself, and whosoever blinds himself, will do so to his own harm, and I (Muhammad) am not a watcher over you”[al-An’aam 6:104] 

Mufti Menk - Guidance (The Way of Light)