i think this is about the deep meaning of "love",it show us what's true love, that's thoughtful! if you always say you love someone or something audaciously and loudly,letting people around all know that. that's too green and presumptuous, and that's a kind of shallow love, it seems like that you were just a spoiled child, never mindful for those who has always been there with you, never cares much. your soul which was supposed to has potential of developing the ability to happy for happiness and sorry for sadness hasn't been moisturized because of the love you said that often. your soul is the same superficial as before. you know little and feel little about life. We each grow as a result of caring and being cared for; we each share in an enriching experience that does not detract form our being. True love, it can be still, you may not see its power as sounded. it shows the rise of a rich soul due to the vicissitudes of life experience ,like a warm smile. love is restrained, you always need to be thoughtful for those you cares. you always have to make a choice. anyway, it's real life and the experience have built who you are.

If you like some one, you will have a lust and unbridled passion for him or her.(without taking your beloved's feeling into consideration) If you love some one, you will know when and how to control your feelings in order not to hurt him or her. The translation above from my point of view is for your reference only.

This sentence comes from movie “Never meet again” “后会无期”. It means if you like a person, you will be trying to give him the best what you can do. But you would not consider his feelings. These things you do for him is simply awful. It is presumptuous. Love a person, that is try to figure out her psychology, to understand her, to know the depths of her heart most desired, to make her happy. So you will ignore your own, to give up many your ideas. You will restrain your selfrighteous which could hurt her.