A river new—
Ancient words unneeded.
See, tough, rushing beauty,
Drink crystal flow.
When we stand on the banks of a river, we must realize that it is constantly new. Although we might say that it was running long before we were born, its exact configuration—the particular currents, the way it flows around rocks, the shape of its banks, the paths of fish in its depths—is subtly unique at any given moment. To know the river, we only need to experience it directly: to touch it, to swim in it, to contemplate it, to drink it. The same is true of Tao.
Tao is ever flowing. Although it was present since the beginning of time and though many have experienced it, it is here for us to explore today. Touch it. Swim it. Contemplate it. Drink it. If you have touched Tao, you should harbor no doubt about it, nor should you wonder that you need scripture to confirm it.