This proverb likens human relationships to handling cotton. In a relationship of love or friendship, it is crucial to take care of the rough patches (worn parts) and strengthen the moments of weakness (tears). Just like cotton, which is fragile but valuable, a relationship requires attention and effort to endure. In other words, one should not give up at the slightest problem but rather work together to overcome challenges. The English equivalent might be: ‘Love requires constant care.’