Not a quote from the books, just a beautiful poem I found.

Warrior Cats Oath

I'll remember Brightheart,
When I see a scar one someones face.
I will think of WindClan,
Every time I win a race.

I'll remember Silverstream,
When I see a young mother.
I'll remember Violet,
When I worry about my brother.

I will remember Goosefeather,
When nobody believes me.
I will think of Scourge,
When someone's teased for being tiny.

I'll remember Mothwing,
When I find it hard to believe.
I'll be reminded of Princess,
When I see someone, who seems naïve.

I'll always think of Heathertail,
When someone wants to be 'just friends'.
I will think of StarClan,
When I am near the end.

I will think of Tawnypelt,
Whenever I feel judged.
I will think of Darkstripe,
When somebody holds a grudge.

I promise to remember Cinderheart,
When I climb a tree.
I'll remember Midnight,
Whenever I'm at sea.

I'll remember Leafpool,
When I must follow my heart.
I will think of Hollyleaf,
If I ever fall apart.

I'll remember Brambleclaw,
When I must prove myself.
I'll remember Spottedleaf,
When I'm suffering from bad health.

I'll remember Lionblaze,
When I am feeling strong.
I'll remember Tigerstar,
If I choose the path thats wrong.

I'll remember Dovewing,
When I hear of something far away.
I'll remember Cloudtail,
When a kitten catches their first prey.

I'll remember Bluestar,
Whenever I must choose.
I'll remember Crowfeather,
When the one I love, I loose.

Feathertail will be in my mind,
Whenever I must be brave.
And I'll remember The Tribe,
When I'm in a cave.

I'll remember Ashfur,
When somebody breaks my heart.
I'll remember Barley,
When me and my siblings are far apart.

I'll remember Ivypool,
When I try to be the best.
I'll remember Firestar,
When my loyalty's put to the test.

I'll remember Crookedstar,
If someone abandons me.
I'll remember Ravenpaw,
If I ever have to flee.

I'll remember Jayfeather,
When I have a strange dream.
I'll think of Cherrytail and Sparrowpelt,
Whenever I eat cream.

I'll always think of Cinderpelt,
When my leg is sore.
I'll remember Longtail,
When I can see no more.

I'll remember the many battles,
When I see conflict or strife.
I promise to remember all these cats,
For the rest of my life.