"We are born once and cannot be born twice, but we must be no more for all time. Not being master of tomorrow, you nonetheless delay your happiness. Life is consumed by procrastination, and each of us dies without providing leisure time for himself"-Epicurus, 6th Vatican Saying
The good wisdom gets passed around. Somebody in every culture and time is virtually guaranteed to either borrow the good stuff from another culture, or discover it for themselves and find a unique way to phrase it.
As a frequenter of atheist blogs, books, and youtube debates, I've run into the following point several times (paraphrased): 'If there was a huge calamity and mankind had to start from scratch with zero knowledge and memory of the past, and zero relics, all of the scientific laws would be discovered again. Religions may (and probably would) arise, but they would be different'. I'm too lazy to look up who originally made this point, but whoever it was was generally right; because religion is made up, any religions created in this calamity scenario would be unique to the ones we have now (because religion is man-made). I don't think they are wholly right, because I think there are true observations made by many religions. 'The Golden Rule' thing comes to mind. Since the good parts of religion are the result of anthropological pop-psychology--and since pop-psychology is based on anecdotal observation--some of the truths discovered by the contributors to the world's religions are bound to be true, even if only by accident.
This one by Epicurus is one of those truisms about the good life discovered by observing the human animal that would be discovered again if today and tomorrow were divided by a road paved by Cormac McCarthy.
Rabelais was the first to say 'Do What Thou Wilt', while Jesus--in summary--told us to 'Do What Thou Ought'. Epicurus--ever the moderate--comes down in the middle with 'Thou Ought to Do Some Of Those Things That Thou Wilt'. Except of course, Epicurus wasn't much of a 'Thou Shalt' kind of guy.
This saying--along with the carpe diem sayings of Jesus and Rabelais--can be taken as irresponsible 'eat,drink, and be merry' stuff, but in actuality, the irresponsible 'eat, drink, and be merry' stuff isn't so irresponsible either. Anything can be used as license by the irresponsible. The whole thrust is that we would be happier if we allowed ourselves time to stop storing up treasures in heaven, or kudos with the boss, and fully inhabit and appreciate a world that we would care to. While it's inevitable that we all will need to spend some time doing things that we may not want to do (working out, going to work on the odd Saturday, visiting with our in-laws), maintenance is part of the good life too. It's important that we save and plan ahead. It's also important that we not feel like we need to 'steal' time for ourselves.
The time we have is ours. The time we use to pursue things that bring us pleasure--the ultimate good--is not stolen time. Rather than thinking of the time you spend reading a mystery novel, tossing a ball with your kid, or drinking a beer and talking with your friends as some kind of gift from the system, think of it time spent as it should be.
By all means, you can find meaning in your work too; I do. But as Dr. Seuss so perfectly puts it, 'Life is a great balancing act'.
Leisure time isn't frivolous. That's one of the great sins perpetrated on America by the Puritans. Leisure time is no more frivolous than sleep and exercise, and it's just as necessary.