By far my favourite quote of the movie and something that I hold true to in life is:
"Life will knock us down but we can choose whether or not to get back up."
What this means is that, whatever happens in life, the most important thing is how we respond to happenings in life. In a fight or spire, your opponent will have times where they will knock you over to the ground. The thing to worry about is not that you are on the ground, but what will you do next? This has parallels to life. There will always be times of joy, but also times of sadness, suffering and hardship. What makes someone who they are is not what kind of 'times' they are in, but moreso how they respond to life's situations as they come and go. This shows one's true character and heart.
This is just like humans and sin. Sin has knocked us all over. Satan is knocking us over as we speak. But God has given us the opportunity to get back up. Its our choice, and our response is the most important decision we make in this life. This response defines where our true heart lies, and where our eternal security is.