Great spirits have always encountered violent opposition from mediocre minds. Albert Einstein
Absence diminishes mediocre passions and increases great ones, as the wind extinguishes candles and fans fires. Francois de La Rochefoucauld
The mediocre teacher tells. The good teacher explains. The superior teacher demonstrates. The great teacher inspires. William Arthur Ward
In large states public education will always be mediocre, for the same reason that in large kitchens the cooking is usually bad. Friedrich Nietzsche
Most of our pocket wisdom is conceived for the use of mediocre people, to discourage them from ambitious attempts, and generally console them in their mediocrity. Robert Louis Stevenson