"I swear on the River Styx."
 [Percy Jackson and the Olympians]

"We all bear scars, mine just happen to be more visible than most." 
[Throne of Glass]

"To the stars who listen and the dreams that are answered." 
[A Court of Thorns and Roses]

"I solemnly swear that I am up to no good."
[Harry Potter]

"With love comes loss son. It's part of the deal. Sometimes it hurts, but in the end, it's all worth it. There's no greater gift than love."
[How to Train Your Dragon] 

"Imperfection is beautiful."
[She Ra] 

"If you get too worried about what could go wrong, you might miss a chance to do something great."
[Voltron]

"Real bands save fans, real fans save bands."
[5 seconds of summer]

"Laughter is timeless. Imagination has no age. And dreams are forever."
[Disney]

[insert more fandoms but i'm too lazy to list them]