We spend all our life in different kind of grievance, we always claim why Allah did with us. We always blame Allah that He will not give us wealth, health etc. But the question is very important whom will not grieve, and what a man do to give reward from His Lord. To understand the things we all must follow the following verse of Holy Quran:
"Surely those who believe, and those who are Jews, and the Christians, and the Sabians. whoever believes in Allah and the last day and does good, they shall have their reward from their Lord, and there is no fear for them, nor shall they grieve."
(Para No: 1 & Verse No: 62)
This verse informed us that the heaven not only meant for the Muslims and reward is not only for the Muslims. This verse informed us that the humans who belongs to the different religions will believe in one Allah, last day and do the good deeds will get the reward from their Lord. Question is if we have fear and grievance then it means that we are not in those people who believe. No the fear and grievance belongs to this world. If we will do the good things then Allah give us the place where no fear and no grievance.
But this thing is related to our good deeds. If we do wrong then why we expect good from the Lord. It is the principle of life that we gain what we seed. How we think that we get mango by feeding the seeds of the bananas. So we need to start good thing then we will hope for no fear and no grievance.