No, I'm not getting biblical when I say that patience is a sin. I don't believe having patience means you're going against God's will or anything like that. When I call it a sin, I mean the old definition of the word sin: “to miss the mark”. And which mark is being missed through patience? This present moment, of course...
Patience means you're waiting for something, just like with impatience. Your attention is focused upon a future which doesn't exist, and may not ever exist, yet you're waiting for it to come about. Your energy is being fed into illusion, one that you believe is going to manifest, and you may even be correct, but you're still missing the mark. You're still missing the Present.
Suppose you get what you're waiting for, will you be present then? Putting aside the ridiculousness of making Presence a future goal, really look at what's happening here. Suppose your patience is rewarded, do you believe that's going to break you out of the patterns that keep you focusing upon the future? It's far more likely that those patterns will only be strengthened because you've been rewarded by them.
Patience and impatience, there's really very little difference between the two other than how gracefully you handle the waiting. According to society, one is healthier than the other, but if your goal is to make each moment a joyful celebration of Life, something I highly recommend, neither patience nor impatience will get you there. If you really want to get there, or rather, Here, let go of your dream of the future altogether.