Is it true if we don't hope too much on human, we tend to be stronger?

Your mother is absolutely RIGHT! I remembered watching a Chinese movie by Jet Lee. One bad guy said this 'Ren sher kau cher chi' means 'man should rely on himself'! You can't depend on other fully to complete a task. It might dissapoint you. If you do it yourself whole heartedly, the thing will be perfect to your satisfaction. For you will do your best! For myself personally, I will do my level best in the thing that I want to do. Submit it to God for the outcome, as long as we have done our best, the rest lies in hope!

I find your mother"words are full of wisdom!in fact,most people know it's unreliable to depend on others,but they keep doing so and feel dissappointed constantly...Maybe they deem unconsciously dissappointment due to other people is more acceptable than that due to themselves...after all,it is not easy to being a strong man and count on oneself.