Summary
This quote suggests that those who are truly exceptional or outstanding in their abilities or achievements cannot always perform at the same high level. It implies that mediocrity is characterized by consistently average performance, whereas those who strive for greatness may fluctuate in their performance or have moments of perceived "mediocrity." This can be interpreted as a call to embrace imperfection and understand that even the most talented individuals have their off days or phases, rather than always expecting peak performance.