“ Don't you ever get the feeling that all your life is going by and you're not taking advantage of it? Do you realize you've lived nearly half the time you have to live already? ”
Source: The Sun Also Rises
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I swear by my life and my love of it that I will never live for the sake of another man, nor ask another man to live for mine. 
Don't part with your illusions. When they are gone you may still exist, but you have ceased to live. 
You don't believe things because they make your life better, you believe them because they're true. 
So many people enter and leave your life! Hundreds of thousands of people! You have to keep the door open so they can come in! But it also means you have to let them go! 
Do not let the memories of your past limit the potential of your future. There are no limits to what you can achieve on your journey through life, except in your mind.