English to Japanese Science Psychology attention (mindfulness)-training method

In instruction 4 below, what does "judge" mean?

1. Find a quiet, private place where you can be undistracted for a few minutes — for instance, close your office door and mute your phone.
2. Sit comfortably, with your back straight but relaxed.
3. Focus your awareness on your breath, staying attentive to the sensations of the inhalation and exhalation, and start again on the next breath.
4. Do not judge your breathing or try to change it in any way.

I'd greatly appreciate it if someone out there let me know the meaning of the 4th sentence.
Many, many thanks in advance!!