Just as our lives have a beginning, they also have an ending.
There are many things that we will experience in our lives that will stay for a long period of time, but the only thing that will last forever is our relationship with the almighty God, everything else will eventually expire, no matter how much we may not want it to.
This doesn't mean that you can't fight for the things in your life that you desire to keep in your life for longer.
There will be battles and tests for relationships we develop with others, there will be battles and tests while we try to maintain a lifestyle that we worked so hard to get to live, and there will be trials and adversity that we must face when we are truly living our lives, instead of just waiting for life to happen.
Not everything we would like to stay forever will stay forever, but as long as you still have breath in your lungs, you have the choice to fight for whatever it is that is important enough for you to fight for.
Not everything you have stays forever, but there are things you would be glad to fight for so you can have them longer.