You should train yourself thus:

In the seen, there is only the seen,
in the heard, there is only the heard,
in the sensed, there is only the sensed,
in the cognized, there is only the cognized.
Thus you should see that
indeed there is no thing here;

…as you see that there is no thing there,
you will see that
you are therefore located neither in the world of this,
nor in the world of that,
nor in any place betwixt the two.
This alone is the end of suffering.

The Buddha, The Udana, 1.10