yesterday , today and tomorrow Learn from yesterday , live for today and hope for tomorrow . This is life which is worth thinking in all our lives and the important thing is not to stop thinking. Thinking is the best teacher in people’s life . People can get a lot from thinking of the past , nowadays and future . Think of past . Maybe we say learning from past is much better . From your memory you may get some happiness and saddness .And what’s more impotant is that you have learnt something such as experience and skills from your past ,which is your precious treasure in your future . Past lets you be much maturer , past keeps you remember some experiences of mistakes and learn from it . Live for today . It’s not just do what the common people do but have your own opinions about what is life and how to lead your life .As we all know , we cannot change the past and we also cannot predict the future . So what we need to do is to think about our lives in the nowadays .After all present is what we can handle with . You can look back to the past and conclude something from it to put what you have got into your life nowadays . Life is a meaningful but abstracting definitin . You cannot touch it but feel its existence . Therefore we should try our best to grasp the present time and live a good life as what we think about . Action says louder than speack . We need think before actions and then we must do to prove what we think is right . Hope for future . Hope is from your enthusiam towards life . It’s a guider to instruct you to the life you wanna . Future is unpredicted and then you require hope to company you when meeting with something hard to judge and decide . Everyone really need this guider . Let’s imagine such a situation . A person live on the earth without any hopes or wishes for all his or her life and then what we think about is how his or her life will be .And he or she will be somebody who walks without his or her body . It’s so t terrible . Hope to people is what water to fish . Past , present and future comprise of our lives . And we are always keeping thinking all our lives ,thinking about yesterday ,today and tomorrow . This is truly the meaning and significance of life . Come on , boys and girls ! Let's fight for our future .