What is the truth of watering flowers, roots and hearts?

It is a common saying to "water trees and roots and make friends". I read it a long time ago and liked the wisdom contained in it, so I always remember it. Water the tree, don't water it unless you water the roots. If you don't have a heart to heart, how can you make real friends? /I read many articles on the Internet recently and found that many people are looking for "sincerity", and they all say that "sincerity" is not well treated. Is that really the case? Maybe! However, I still believe that when we face others with sincerity, we will also get sincerity. /Yes, sometimes, what we give to others doesn't necessarily have the same return. When we hold out a piece of "sincerity", we gain hypocrisy and disappointment is inevitable. However, people who go to extremes are very few after all! If we refuse to talk to each other because we are afraid that "sincerity" will not be treated well, where can we find sincerity? /I remember a foreign scholar said, "Our life is not short of beauty, but of discovery." I'm impressed. If we always look at and measure the outside world from our own perspective, then I think it is inevitable to lose heart. How to look at this diversified world with one eye? /Life, life, endless. We ordinary people can only do what we should, can and must do. As for the rest, we can't force it. /In interpersonal relationships, sincerity is always welcome. However, we can't blindly ask others to be sincere. Sincerity is to be exchanged with sincerity. Only by showing our sincerity can we ask others to pay the same sincerity. Speaking of which, I don't think so either. If we give and get the same return, then we should not take it for granted, but take it as our luck. Sometimes it really is. In this world, it is impossible for everyone to see everything like us, so it is really lucky to meet people who share our views. When we meet, we should be grateful, not taken for granted. If we can look at it this way, then, I think, when we look at "sincerity" in the future, we will not only be disappointed.