日计不足，岁计有余

Explanation: Doing we do not have much day a year must register for a lot. Metaphor add up. Also be used to everything as long as perseverance, you can have a great harvest. 　　Source: "Huainanzi  real training," the Road to Tai Mei Hing, and difficult to move are also calculated. Therefore in terms of lack of day, and more than grant the aged. "