I believe life is constantly testing us for our level of commitment, and life's greatest rewards are reserved for those who demonstrate a never-ending commitment to act until they achieve. This level of resolve can move mountains, but it must be constant and consistent. As simplistic as this may sound, it is still the common denominator separating those who live their dreams from those who live in regret.
Some of the biggest challenges in relationships come from the fact that most people enter a relationship in order to get something: they're trying to find someone who's going to make them feel good. In reality, the only way a relationship will last is if you see your relationship as a place that you go to give, and not a place that you go to take.