So you know the right from the wrong and not go down the wrong path
Thomas Hill's technique is to contend that humans should value nature notwhithstanding their practical or aesthetical use. In nature, the human is placed as a nurturer of nature despite the fact that nature may outlive humans themselves the cycle of natural life.
Juliet is saying that beggers cant be choosers basically, that there is no need or reason to brag but to just be humble and kind.