Perseverance

Perseverance is easily the hardest word to swallow and live while going through a trial. When the trail is long and rough, we've been hiking for hours, and we're worn out holding out to the end is the last thing most of us want to do. We want to stop, to quit. When the tribulation is the harshest and the persecution the sorest most of us don't want to hear anything about enduring; we only want the end to be NOW! In all actuality, when things are the hardest and roughest is when we most need to persevere.
Perseverance is intricately intertwined with patience. It's hard to be impatient and persevere at the same time (hard, but not impossible). While persevering it's necessary to be patient because the end is rarely in our line of sight, but we are arriving there.

I found a quote in seminary one day and kept it. It goes something like this:
"Some men quit when they begin to tire
Other men quit when they're about to collapse
But only the best men know that the body tires long before the mind
It is then that the impossible becomes possible" -unknown-