In simple words, it means to be humble and submissive.

It means that you should not be showy, bold, obvious, arrogant. You shoudl not imply you are better than others (high). . It's basic premise seems to be take an analogue for what you want to be, then try to look not like what you want to be, but like the analogue. . Big cats run fast, so to run fast look like a cat. ? No, even that is too directly ralated. . Need an analogue. . Run like the wind. So if you want to run fast, look like wind. .Might be arguable. . It might be argued that the authour mistakes vivid metaphore for causal reason. The inaccurate reasoning, does not necessarily invalidate the direction.