What does this poem express to you? It is not mine but written by a friend?

He gave to me sweet roses. He left intact the thorns. To teach me to be cautions. As a way to gently warn. Life comes with sweet and bitter. You cannot pick and choose. In order to win the battle You must not be afraid to lose. Sweet are their fragrance. Though their beauty fades [...]

Can you help me with my senior quote?

I am missing the third line of this quote and cannot find it anywhere, does anyone know it or have any good suggestions: Although the beauty fades Ive heard the memories last —–?——- But you can never forget your past