The word mediocrity connotes the quality of being average, barely adequate, ordinary, not very good or not being outstanding. Sometimes, your thoughts deceive you and stop you from thinking great.
Mediocre thoughts can also make you resort to thinking average about yourself and anything you engage yourself in.
It is true that one cannot be great in everything but when you approach whatever you are set to do with mediocre thoughts, be sure not to come out good in that thing because you will always settle for less even when and where you can do much better.
To think small is like a disease but you can only attain greater heights if you can flush it off your system.