It's not about being perfect, it's about being better than you were yesterday.
你送给我桃子,我就回报给你李子。意思是做人要知恩图报,不能忘恩负义。也比喻礼尚往来,相互赠送礼物。
自然选择是残酷的。
预测未来的最好方式就是创造未来。