Musar su Salmi 119:60

The ninth [reason] is that during the days of his old age - with the absence of the power of emotion - he does not have the reserve of strength to create new paths in his heart, to arrange thoughts with which to fight his impulse, to attain virtues and to toil and strive in Torah and in [his] actions (and in the worlds). As it is written (Ecclesiastes 12:1), "So remember your Creator in the days of your youth, before those days of sorrow come and those years arrive of which you will say, 'I have no pleasure in them.'" Therefore, it is appropriate for a person to rush to save his soul, like the matter that is stated (Psalms 119:60), "I have rushed and not delayed to keep Your commandments."

The angels were praised for possessing this good trait as written: "[Bless the L-rd, His angels,] those mighty in strength, who perform His word, hearkening to the voice of His word" (Tehilim 103:20); and "the Chayot dash to and fro like the appearance of a flash of lightning" (Yechezkel 1:14). Behold, a man is a man and not an angel, hence it is impossible for him to attain the might of an angel, but he should certainly strive to do all he can to come as close to that level as possible. King David would praise (G-d) for his portion saying: "I hasten and do not delay to keep your commandments" (Tehilim 119:60).

Therefore, the sages of blessed memory exhorted us: "And you shall watch over the Matzot" - if a Mitzva comes to your hand, do not delay its performance (lit. allow it to become Chametz)' (Mechilta Shemot 12:17).