Keep our expectations realistic.

"The grass is always greener on the other side."
When we see a person close to us succeeding, we are liable to lose ourself.
Don't bite off more than you can chew.

"Rome was not built in a day."
If we want to succeed, we can't have any choice but to do our best at all times.
And don't overexert ourself in whatever we do.
What counts most is keeping the same passion, spirit and motivation.