One of the biggest lessons of life is to know how to say no, and to say "no" when you cant, or youll be in an awkward situation. For example, some activities are not very important and take valuable time. The worse thing is to be busy with little things. It is worse than doing nothing. You have to say no. To be really careful, its just that no matter what other people do, you have to prevent others from getting your own business. You have to say no. Dont belong to anything, or you will not belong to yourself. You cant always ask yourself to be satisfied and always meet other peoples demands. Otherwise the good will get worse, and you must be temperate, so that you can gain the respect and affection of others. Rejection is valuable because its not what youre trying to get yourself to be and accept, and learning to refuse makes you easier, and you can always benefit from it.