You need no further teachings than the above in order to show gratitude, and you must show it truly, in the only real way, in your daily life; our daily life should be spent constantly in selfless activity with no waste of time whatsoever. Time flies quicker than an arrow and life passes with greater transience than dew. However skillful you may be, how can you ever recall a single day of the past? Should you live for a hundred years just wasting your time, every day and month will be filled with sorrow; should you drift as the slave of your senses for a hundred years and yet live truly for only so much as a single day, you will, in that one day, not only live a hundred years of life but also save a hundred years of your future life. The life of this one day, to-day, is absolutely vital life; your body is deeply significant. Both your life and your body deserve love and respect for it is by their agency that Truth is practiced and the Buddha’s power exhibited: the seed of all Buddhist activity, and of all Buddhahood, is the true practice of Preceptual Truth.
From The Shushogi, Zen Master Dogen chapter title Putting The Teachings Into Practice And Showing Gratitude.