As a means of taking your existence lightly and aspiring for the Pure Land, become keenly aware that being alive is a matter of this day only, of the present moment alone. Realize this, and what is now scarcely endurable will be easily borne; your endeavor for the Pure Land will be dauntless.
If you imagine, even casually, that your life will be long, things of this world will swell in importance and all those concerns unrelated to the aspiration for enlightenment will arise. […]
Ultimately, the key to liberation lies in setting your mind on impermanence.