God is inherently good and fair, as He is the same in the past (who was), present (and is - the great I am) and future (to come), great is His faithfulness.
Now we know that, before the New Testament, men who walked with God had the fear of the Lord. You can even take a quick look at Luke 23:31 - 43
At verse 32 - Two other men, both criminals were also led out with him to be executed. When they came to the place called the Skull, there they crucified him, along with the criminals, - one on his right, the other on his left... v35 the people stood watching, and the rulers even sneered at him. They said, "He saved others (by healing the sick and raising them from the dead),; let him save himself if he is the Christ of God, the Chosen One.", v36 the soldiers also came up and mocked him. They offered him wine vinegar and said, "If you are the king of the Jews, save yourself." So this is the scene where Jesus was crucified, the pinnacle of the gospel. Now, drop down to verse 39 and 40 (and I want you to pay close attention to what one criminal has that the other doesn't have): "One of the criminals who hung there hurled insults at him - 'Aren't you the Christ? Save yourself and us!", But the other criminal rebuked him. "Don't you fear God," he said, "since you are under the same sentence? We are punished 'what?' justly, for we are getting what our deeds deserve. But this man has done nothing wrong."
v42, Then he said, "Jesus, remember me when you come into your kingdom." and wow guess what?
v43, Jesus answered him, "I tell you the truth, today, you will be with me in paradise."
If Jesus is telling the truth, then who can say Nay? The fear of the Lord is the only condition for salvation into His eternal Kingdom.