My definition should probably be holding to an extent, where you won't feel any regrets if the price happens to go further than the stage you've hold. Everyone keeps talking about the future, and this future isn't a particular day/time for everyone. Some people's future was yesterday, while others might be today or tomorrow, and so on.

So, I don't think that the recommendation is to actually hold for eternity(by intensionally dying and leaving it), but it is actually to hold for as long as possible, so that when you make a sale, future price increase won't cause much of a regret, even though it actually does.