They mean everything to you— so much it can be difficult to put in the words. Here are the quotes that say it for you.
"Yes, I gave you life... but really, you gave me mine."
"Someday when the pages of my life end, I know that you will be one of its most beautiful chapters."
"To the moon and back, remember?"
"Sons are the anchors of a mother's life."
"Be a unicorn in a field of horses."
"The day you came into my life, I knew what my purpose was. To love and protect you with everything I have."
"Superheroes are often disguised as sons."
"I adore his smile, I cherish his hugs, I admire his heart, but most of all... I love that he is my son."
"No matter how much I say I love you, I always love you more than that."
"You are my son, my moon, and my stars."
"I ma proud of many things in life but nothing beats being a mother."
"To my son. Never forget that I love you. Life is filled with hard times and good times. Learn from everything you can. Be the man I know you can be."
"For all the things my hands have held the best by far is you."
"No one else will ever know the strength of my love for you, after all you're the only who knows what my heart sounds like from the inside."
"Your child is what will keep you holding on, even when everything else falls apart."
"... and she loved a little boy very, very much, even more than she loved herself."