Well, I actually wrote a love note the other day, and I feel it expressed exactly these sentiments, so I'll share it here. Love is the thing that I attempt to express through these words. What a beautiful contest this is. Thanks for putting it on.
My (opinion) of the definition of love and how love expresses itself:
...
If I don't know your happy, nothing really feels like it's worth doing. I know that's very drastic. I know that that may come off as crazy. But I need to say it because I need you to know that you are the only thing that brings me true happiness because you brought true happiness to me. I'd never known what living my most exciting life would be like. I never knew what going on a daily adventure to be better would look like. I never could imagine the feeling that someone would be able to spend every day with me and I not drive them mad. I never knew what it was like to not only be understood, but known in a way where I feel like you know more than I can literally fathom exists. It just seems that way and I have no proof for it except for what I hear you say and what I see manifested around us on a daily basis. It could be the littlest thing like the Dave Chapelle special's name (equanimity and something about a bird) or it could be the way you inject thoughts of creativity, fascination, and wonderment of the world into my ugly mug. I don't know how to explain you to someone outside of my brain, but to you I can explain you as the "one that makes me know life is worth living, that you can get through anything if you work hard, that you can be understood and you can be better every single day regardless of how good you think you are today. You are the one I am excited to marry. You are the one I'm excited to kiss. You are the one I'm excited to work out with. You're the one I'm excited to sit next to. You're the one that excites me the most when I see words from you. You're the one whose smile makes me smile the largest. You're the one that I always want happy even if I'm furious, you're the one who when you cry I break inside. You're the one that I can't wait to grow old with. You're the one that I can't wait to stay young with. And last and most important, you're the one that I love with every ounce of my understanding of how to love and you are the one to which I promise to never disappoint and to never be apart from; you are the one who I know deserves everything, and I am going to, to the best of my ability, be my most To hopefully bring you that which can be likened to the examination of a grain of sand for 1 second as compared in scope with that of the massive expanse of the unknown reaches of matter itself over the time period of maximum length which we have any scientific evidence for. I realize my insignificance in the vast reaches of existence, and I realize how stupid that could make me seem for thinking I can change anything about anything in a lasting way, but the one thing which I have no doubt over is that I will make you as happy as I can possible fathom how to do. I will absolutely always do my best to show you how good of a friend I can be. I will always do my best to show you how romantic, how good of a lover, how understanding and patient and kind I can be. I will fail to be my best every single day but i will always attempt to continue to reach higher and make you happier than I did the day before. You are my everything and you are my reason for existence for without you I would want to exist not at all, knowing all of the positivity you bring to my life now. Thank you for always being there for me, and with this I pledge to continue our journey together in a way that absolutely maximizes how much you are appreciated, loved, comforted, taken care of, and provided for in a way where you can reach your highest potential. I truly have no inkling of all the wonderful amazing things you are capable of. Everyday, you do more and create more opportunity than I thought possible. So I no longer even consider a limit for your talent. I look forward to and am honored that I just get to be a part of it. You are my guiding super star, and I am yours forever. I love you, I love you, I love you, I love you.