Based on the person-centered perspective, being is not one of the ways people nurture the growth of others

Being too self centred would be the answer.

According to person-centered perspective, there are only 3 ways for use to nurture the growth of others:
- Being genuine (honestly want to help without expecting something else)
- Being accepting (and maintain non-judgemental attitude toward other's defect)
- Being emphatetic (and try to see the problems from other people's perspective)

The  ancient egyptians  who  built the pyramids  may have been  able  to move massive stone blocks across the desert by wetting the sand in front of a contraption  built  to pull the heavy objects