Keep On Truckin'

Sometimes life doesn't  always go the way you thought it would.  Most times things don't happen because of anything you did at all.  Most likely, there was absolutely nothing you could have done about it.  You've fallen off the horse.  But guess what all you have to do in order to find what you're looking for?  You just have to get back on.
Maybe you are going through a break-up.  Perhaps you've recently been laid off from your job.  It could be that everything is going great on the outside, but on the inside you just don't feel like yourself.  Whatever it is, we wanted to provide you with some quotes that will get you back on that horse so you can keep on truckin'.
"Adventure begins when comfort has left you."
"Everything in life is temporary.  So if things are going good, enjoy it because it won't last forever.  And if things are going badly, don't worry.  It can't last forever either."
"Don't be discouraged. It's often the last key in the bunch that opens the lock."
"Optimism is the faith that leads to achievement." --Hellen Keller
"Experience: the most brutal of teachers.  But you learn, my God do you learn." --C.S. Lewis
"The best kind of relationships begin unexpectedly.  When you get the astonished feeling and everything happens so suddenly.  That's why you don't look for love.  It comes to you just at the right time.  The time you never thought it would have."
What are some quotes that you like to remember in times like this?