People who love constant love, and vice versa.

爱人者人恒爱之，反之亦然。

Is constant love deemed there but want of wit.

坚决的爱在天上也被认为是缺乏智慧？

I will pay you back with my smile and my constant love.

我将用微笑和我始终不变的爱来回报你。

What affection stifles and puts to one side the love, the tender constant love you promised him?

什么爱情抑制并排挤了你曾经许诺给他的温柔而忠诚的爱情？

But it has also, for centuries, been the colour of beauty and of constant love.

但它并且有，世纪，是秀丽的颜色和的恒定的爱。