A quote I'll always remember, though not verbatim, is Paulo Coelho's quote on how if we experience the same challenges and problems again and again in life, it means that we have not learnt our lesson.
Check out this excellent article from Daily OM: http://www.dailyom.com/articles/2012/32081.html
Repeated bouts of adversity are an unavoidable aspect of human existence. We battle against our inner struggles or outer world forces, and in many cases, we emerge on the opposite side of struggle stronger and better equipped to cope with the challenges yet to come. However, we can occasionally encounter trials that seem utterly hopeless. We strike at them with all of our creativity and perseverance, hoping desperately to bring about change, only to meet with the same results as always. Our first instinct in such situations is often to push harder against the seemingly immovable obstruction before us, assuming that this time we will be met with a different outcome. But staying power and stamina net us little when the same choices consistently garner the same results. A change in perspective, behavior, or response can do so much more to help us move past points where no amount of effort seems sufficient to overcome the difficulties before us.
Whether our intention is to change ourselves or some element of the world around us, we cannot simply wish for transformation or hope that our lives will be altered through circumstance. If our patterns of thought and behavior remain unchanged, our lives will continue to unfold much as they have previously. Patterns in which fruitless efforts prevail can be overcome with self examination and courage. It is our bravery that allows us to question the choices we have made thus far and to channel our effort into innovation. Asking questions and making small adjustments to your thought processes and behaviors will help you discover what works, so you can leave that which does not work behind you. To break free from those unconscious patterns that have long held sway over your actions and reactions, you will likely have to challenge your assumptions on a most basic level. You must accept once and for all that your beliefs with regard to cause and effect may no longer be in accordance with your needs.
Stagnation is often a sign that great changes are on the horizon. Courting the change you wish to see in yourself and in the world around you is a matter of acknowledging that only change begets change. The results you so ardently want to realize are well within the realm of possibility, and you need only step away from the well-worn circular path to explore the untried paths that lie beyond it.