Al-Hasan Al-Basri (may Allah have mercy upon him) said:

“Almighty Allah has not set a deadline for a believer’s having to do good deeds, except death.”

Then he recited Almighty Allah’s words: And serve thy Lord till the inevitable (death) cometh unto thee (Al-Hijr 15:99)

“No amount of guilt can change the past and no amount of worrying can change the future. Go easy on yourself, for the outcome of all affairs is determined by Allah’s decree. If something is meant to go elsewhere, it will never come your way but if it is yours by destiny, then it cannot flee from you” [Umar Ibn al-Khattab]

Sheikh Zahir Mahmood explains the danger of people that claim “Only i am on the haq”.

Unfortunately we see too many people especially at universities who think they are have a God given right to look down on other people because they claim to be on the HAQ [truth]. This is highly prevalent in Islamic societies. Alhumdulilah not all of them are like that off course.
Credits:Hanafi Fiqh Channel

And indeed We created you, then designed you and then ordered the angels, “Prostrate before Adam”; so they all prostrated, except Iblis (Satan); he did not become of those who prostrate. [Al-‘A`rāf 7:11]

The Angel of the Mountains said, “O Muhammad, order what you wish. If you like, I will let the mountains fall on them.” The Prophet صلى الله عليه وسلم said, “No, I hope that Allah will bring from their descendants people who will worship Allah alone without associating partners with Him.”

[Sahih Bukhari, Volume 4, Book 54, Number 454]