让爱永驻人间：

Let love last forever.

爱是永恒的，外表可能改变，但本质永远不变：

Love is something eternal； the aspect may change, but not the essence.

爱情永不死：

Love never dies.

治疗爱的创伤唯有加倍地去爱：

There is no remedy for love but to love more.

真挚恋爱过的心永不忘却：

The heart that once truly loves never forgets.

爱情是生活最好的提神剂：

Love is the greatest refreshment in life.

有了你，黑暗不再是黑暗：

The darkness is no darkness with thee.

爱是长在我们心里的藤蔓：

Love is a vine that grows into our hearts.

这些句子都表达了爱的永恒性和重要性，适合用来表达让爱永驻心中的愿望。