What is the meaning of an untrodden way, or of "there are none to praise" her but "very few to love"?

没有人走过的路是什么意思呢？,还有“没有人赞扬她“但是“几乎没有人爱她“又是什么意思呢？

耶鲁公开课 - 文学理论导论课程节选

And they continue to support or to practice self-esteem as indiscriminate praise, ultimately hurting more than helping.

他们依然认为,提升自尊就要不加区别地赞扬，这最终造成的伤害大于帮助。

哈佛公开课 - 幸福课课程节选