Master Dogen said ‘Zazen is itself Enlightenment,’ there is nothing to pursue …

Thus, as you can, do not think ‘this’ vs. ‘that’, forget ‘likes’ ‘dislikes’ … do not think ‘me’ – ‘not me’ … dropping all such dividing images from mind. Just Sit, in the open space in between.

This is also ‘not pursuing’ …

ijun wazukani okoreba, funzen to shite shin o shitsu.

However, if there is a thousandth or a hundredth of a gap, heaven and earth are far apart, and if a trace of disagreement arises, we lose the mind in confusion.[Nishijima]

And yet, if there is a hairsbreadth deviation, it is like the gap between heaven and earth. If the least like or dislike arises, the mind is lost in confusion. [SZTP]