The mind can at most observe itself. It cannot understand. The mind can at most go close to its functioning and note the details. No machine is blessed with power of understanding. But yes, the mind is a very nicely designed machine that can observe, register, make notes, store and compare.
The mind is equipped for activity. The mind is equipped only for activity. There is nothing called a still mind or a silent mind. When you say mind, what you mean is a mechanism that is functional, moving, changing. Things are coming and going; thoughts are rising and falling. Mind is activity. And understanding is the sublimation or dissolution of all activity.