Delete yesterday, keep today, strive for tomorrow, stick to the right, give up the wrong, tell me the meaning of this sentence,

This sentence means that in one day, we should keep a positive attitude and constantly strive to pursue our goals. First of all, we should bravely delete the unpleasantness and mistakes of the past and leave room for the future. Secondly, we should cherish the present opportunities and everything we have, and don't give up easily. Finally, we should strive for tomorrow's success and progress, constantly adhere to correct beliefs and actions, and at the same time learn to give up those things that are not suitable for us. In short, this sentence encourages people to keep a positive attitude and pursue their dreams and goals within one day.