縱橫逆順,直復不聞
Vertical or horizontal, against or following, straight or turned over is not made known.
縱 vertical, to jump in the air
橫 horizontal, at a right angle (as opposed to 縱), unrestrained
逆 to oppose, to go against, backwards, contrary
順 to follow, along
直 straight (as opposed to 彎, 曲 crooked), simply
復 turn round or over, to repeat, to return to an original state, hexagram 24th of the Yijing
不 no, not
聞 hear, smell, to make known
This last sentence seems to stress on the need to be stealthy, to avoid having one‘s intentions uncovered.