“Christianity asserts that every individual human being is going to live for ever, and this must be either true or false. Now there are a good many things which would not be worth bothering about if I were going to live only seventy years, but which I had better bother about very seriously if I am going to live for ever. Perhaps my bad temper or my jealousy are gradually getting worse – so gradually that the increase in seventy years will not be noticeable. But it might be absolute hell in a million years: in fact, if Christianity is true, Hell is the precisely correct technical term for what it would be. And immortality makes this difference, which, by the by, has a connection with the difference between totalitarianism and democracy. If individuals live only seventy years, then a state, or a nation, or a civilization, which may last for a thousand years, is more important than an individual. But if Christianity is true, then the individual is not only more important but incomparably more important, for he is everlasting and the life of a state or a civilization, compared with his, is only a moment.”
C.S. Lewis
from Mere Christianity

Our life here on earth is very short compared to our eternal life in the Kingdom of Heaven.
Therefore, it would behoove Christians to live the kind of life that Christ wants us to live on earth. Otherwise, we may not be so luck as to enter the Kingdom of Heaven.
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