Yoshitsune was a famous warrior who lived in medieval Japan. Because of the situation of the country at that time, he was sent to the northern provinces, where he was killed. Before he left he bade farewell to his wife [Lady Shizuka], and soon after she wrote in a poem, “Just as you unreel the thread from a spool, I want the past to become present.” When she said this, actually she made past time present. In her mind the past became alive and was the present. So as Dogen said, “Time goes from present to past.” This is not true in our logical mind, but it is in the actual experience of making past time present. There we have poetry, and there we have human life.
Shunryu Suzuki, Zen Mind, Beginner’s Mind
Do not think that time merely flies away. Do not see flying away as the only function of time. If time merely flies away, you would be separated from time. The reason you do not clearly understand the time being is that you think of time only as passing.
In essence, all things in the entire world are linked with one another as moments. Because all moments are the time being, they are your time being.
The time being has a characteristic of flowing. So-called today flows into tomorrow, today flows into yesterday, yesterday flows into today. And today flows into today, tomorrow flows into tomorrow.
Dogen, Shobo Genzo/Treasury of the True Dharma Eye, Uji/The Time Being