The Mishna in Pirkeh Abot (5:20) instructs that one should "run like a deer" ("Ratz Ka'sevi") to fulfill Hashem's will. This refers to the requirement to perform Misvot energetically, with enthusiasm, and not lethargically, as though we would rather be doing something else.
People often run to the synagogue when they are late for the Minyan – but the truth is that one should always "run like a deer" to shul, even when they have plenty of time. Walking fast to the synagogue shows one's enthusiasm and eagerness to serve Hashem, and so regardless of the time, even if one is early, he should walk briskly to shul.
This also means that one should not procrastinate when it comes to Torah learning or Misva observance. If a person has an opportunity to learn or to perform a Misva, he should proceed to seize the opportunity immediately, without delay. Otherwise, he gives the Yeser Ha'ra (evil inclination) a chance to interfere, to disrupt his plans by trying to convince him not to perform the Misva.
Finally, this admonition requires us to strive to perform Misvot ourselves rather than delegate them to others. The Gemara in Masechet Kiddushin (41a) establishes, "Misva Bo Yoter Mi'bi'shluho" – it is preferable to perform a Misva oneself than to discharge one's obligation through an agent. Personally tending to a Misva demonstrates one's love for the Misva, and that he cherishes opportunities to serve his Creator. There are certain Misvot that may be performed through an agent, a rule known in Halacha by the expression "Sheluho Shel Adam Ke'moto" – "A person's messenger is like himself." However, Hacham Baruch Ben-Haim noted that the word "Kemoto" in this expression can be read to mean "like his death" – warning that accustoming oneself to delegate Misvot is a type of spiritual demise. We achieve spiritually and build our relationship with Hashem by pursuing Misva opportunities, by lovingly and excitedly involving ourselves in Misvot, without looking for other people to do them for us.