What sentence did the outsiders use sagely?

In S.E. Hinton's novel "The Outsiders," the phrase "Stay gold, Ponyboy" is used sagely. It reflects the idea of preserving one’s innocence and appreciation for beauty in life despite the harsh realities of the world. This advice symbolizes the importance of holding onto one's true self and values, even in the face of adversity. It serves as a poignant reminder to appreciate the fleeting moments of goodness and purity.