Saying farewell to a friend can be difficult, but a heartfelt and thoughtful note can be a great way to show them how much they mean to you. Here's an example of a farewell message you could write on a greeting card:

Dear [Friend's Name],

As our paths go separate ways, I wanted to take a moment to express my deepest gratitude for your friendship. The time we've spent together has been filled with so many fond memories and I will cherish them forever.

You have been an incredible friend, always there to lend a listening ear, a kind word, and a helping hand. You have been a constant source of support and encouragement, and I am so grateful for everything you've done for me.

I know that even though we will be apart, our friendship will always be a special bond that connects us. I wish you all the best in your future endeavors and I hope our paths will cross again soon.

Thank you for being such an amazing friend. I will miss you dearly and I hope that we can keep in touch.

With love and friendship, [Your Name]

Remember that it's important to be sincere and heartfelt when writing a farewell message. Express your feelings honestly and let your friend know how much they have meant to you.