Something that's easy
. That everyone has a different situation
, different emotions
, different interests
, different sensitivities
Some are confident, able to speak in front of large crowds without nervousness and dismiss insults. Others aren't as confident, unable to do public speaking, sent into tears from a nasty comment.
Some have drive from within, working hard all the time to achieve goals. Others need some sort of incentive from outside. Some can benefit from even the worst situation, others mess up great opportunities.
Some are happy to conform, others loathe the idea. They're tall or short, thin or fat, light or dark, friendly or unfriendly. Some are born to wealthy politicans, others to poor druggies.
Never forget this, and remember that even if you can do something, it doesn't mean that everyone else can also.