The truly still mind, with which you were born, is the mind that moves freely. 

Without ignoring anything, it reacts wholeheartedly to everything it encounters, to everything on which it reflects. 

And yet, for all that, it is the mind that is never seized by anything, but is always ready to react on the spot to whatever it encounters next. 

The mind that is still is the mind that never forfeits its freedom and is able to constantly keep rolling and rolling and rolling

Sōkō Morinaga (1925 CE-1995 CE), Sōkō Morinaga was a Rinzai Zen roshi. He was head of Hanazono University and abbot of Daishu-in in Kyoto, one of the sub-temples of the Ryōan-ji temple complex.