"There truly is a reward for those who live for God; surely there is a God who judges justly here on earth."
If you do the right thing, you should be rewarded. If you do the wrong thing, there should be consequences. Every one of us is responsible for our own actions and thoughts and every action has a consequence. Those who live for God and believe in His Word should have a definable and predictable result. Surely there is a God of justice here on the earth as well as in Heaven. Surely we will be rewarded if we trust in the Lord. If you reject God and set yourself up as the author of the universe you will also reap predictable results. God's justice is perfect. Your choices lead to your results as you reap what you sew!
What is the reward for those who live for God? They will be given eternal life and not have to die the second death. They will be born into the kingdom of God and after life here they will be in Heaven for eternity. Everyone dies once, and then the judgement. Those who have been born of the spirit and accepted God's Salvation receive eternal life as a child of God. Those who have rejected God will be separated from Him and die the second death that is also eternal. This will be as a direct result of their rejection of God and their disrespect of His Salvation. They will receive the perfect justice they deserve because they would not live for God here on earth.
When people argue that God is not a Just God, or when they ask how could a Good God allow bad things to happen, remember the reward for people is proportional to their actions. There is a reward for those who live for God. The have accepted God personally and then lived for Him. Their reward is the direct result of their action. Everyone has free will and you can choose to accept or reject God. You do not have to accept His free gift of eternal life and you can reject God or make no decision about God, which is the same as rejection in that there is no acceptance. Everyone will reap the rewards of their action or inaction. Live for God and truly you will be rewarded.