(Hebrews 12:14 ESV)
Here's an interesting take on this verse from J. C. Ryle's Holiness ... a view on holiness which many have never considered before.
"We must be holy, because without holiness on earth we shall never be prepared to enjoy heaven. Heaven is a holy place….Suppose for a moment that you were allowed to enter heaven without holiness. What would you do? What possible enjoyment could you feel there? To which of all the saints would you join yourself, and by whose side would you sit down? Their pleasures are not your pleasures, their tastes not your tastes, their character not your character. How could you possibly be happy, if you had not been holy on earth?"