What is heaven and where is it? Know now
This is the reason why many have given up on such a desire. Actually, most Christians are just passing time: They are not sure if they will be admitted there but in case it is true and they can be admitted, then they are somehow practicing their holiness basing on chances. And you know what! We cannot be good Christians if our belief is doubted, if we are not sure of it all. Our desire for heaven is weak and our strength to overcome evil is negligible, we may miss the mark.