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.
The word samadhi carries within itself two absolutely contrary meanings: "perfect reception" and "perfect non-reception." In order to "perfectly receive" each instant as it occurs, it is necessary to "perfectly not-receive" the previous instant and the future instant. No matter how accurately and in what detail a mirror may reflect what is before it in one instant, should it be turned to face a new direction, the previous reflection will disappear without a trace and the mirror will faithfully reflect what is newly before it.
The mind that neither ignores anything nor attaches to anything is not something that is obtained through training. It is the natural power with which you entered this world.
See also: "There Is No Trash"