The last revelation from Allah, is the final Words from God and final guidance. And Allah guarantees Paradise and guides whomever He wants. He is the one who admits paradise to whomever He wants and has mercy upon whomever He wants. Although, asking and seeking paradise from Allah and guidance from Allah is the correct thing to do. Supplicating to God.
"And in the Heaven is your provision and whatever you are promised." - 51:22
Allah created a home in Paradise and a home in Hellfire for every single human being and whoever is on the path of Allah, the guidance of Allah will not get lost and will not fail and will not be a failure in the afterlife, on Day of Resurrection. Which means believers have to strive for sake of God and never despair of the Hope and Mercy of Allah. Despair is for the lost.
And my Lord guarantees His Paradises, His Rewards and His Promises will be fulfilled. And has more..rewards greater than Paradise itself.
Worshiping Allah is that very success and striving for His sake alone, following His guidance and His path. And Allah knows who is following His path, who is striving, who believes in the truth and who doesn't.
For good souls and bad souls, each will get what he/she deserves and what he/she has earned from Allah; whether one has truly sought and received goodness from Allah in this life and for the afterlife or not. Allah is the Just and the Master of Judgement Day.
"Allah is the Protecting Friend of those who have faith: from the depths of darkness He will lead them into light."
- 2:257
"These are Verses of the Wise Book, A guidance and a mercy for the good. Those who establish worship and give regular Charity, and they are certain of the hereafter. These are on a {true} guidance from their Lord, these are the ones who will prosper {and they will have everlasting happiness}." - 31:2-5, Surat Luqman
"And whoever puts all his trust in Allah, He will be enough for him." - 65:1
Please watch the link in my profile called Scattering Winds, click and see the one that matches.
I will also post very interesting and good links in the comments as well. You're welcome to watch and see or listen. It has much to do with your question.
"And some of them there are that listen to thee, and We lay veils upon their hearts lest they understand it, and in their ears heaviness; and if they see any sign whatever, they do not believe in it, so that when they come to thee they dispute with thee, the unbelievers saying, 'This is naught but the fairy-tales of the ancient ones.' And they forbid {men} from it and avoid it, and they ruin none save themselves, though they perceive not." - Surat Al- an'am {The Cattle}, 6:25-26
“This is the Book: There is no doubt about it. A perfect guidance for the God-revering, pious, who keep their duty to God.” {Al-Baqarah, the Cow, 2:2}
"So I swear by what you can see and by what you cannot see: this {Quraan} is the speech of an honored messenger, not the words of a poet - how little you believe! - nor the words of a soothsayer - how little you reflect!
"This {Quraan} is a revelation sent down from the Lord of the Worlds: if {the Prophet} had attributed some fabrication to Us, We would certainly have seized his right hand and cut off his lifeblood, and none of you could have defended him."
"This {Quraan} is a reminder for those who are aware of God. We know that some of you consider it to be lies this will be a source of bitter regret for the disbelievers but it is in fact the certain Truth. So {Prophet} glorify the Name of your Lord, the Almighty." - Surat Al-Haqqah, 'the Inevitable Truth','The Reality' {69:38 - 69:52}"