Software disenchantment. "Windows 95 was 30MB. Today we have web pages heavier than that! Windows 10 is 4GB, which is 133 times as big. But is it 133 times as superior?"
Applying to Ph.D. Programs in Computer Science by Professor Mor Harchol-Balter at CMU. Basically a CS version of Tevelev's post above. If you are thinking of applying to Ph.D. programs in CS, please, do read this first (in fact, multiple times, especially Sections 3.5 and 5).
Does one have to be a genius to do maths? by Terry Tao (Wiki), 2006 Fields Medalist. "The objective in mathematics is not to obtain the highest ranking, the highest “score”, or the highest number of prizes and awards". If you are a Korean speaker, read also this episode of a webcomic about it.
Math is Personal. In case you do not understand why teachers are often called the engineers of human soul. Learning is very deep and students are too valuable to be just classified using some letters and numerics.
Why won’t anyone teach me math? I agree that a certain level of difficulty must be maintained in curriculums. However, systemically refusing to help or educate students is not a reasonable method of keeping that standard.
The 4 R's of Graduate School by Manuel Blum (Wiki), 1995 Turing Award winner. "Without writing, you are reduced to a finite automaton. With writing you have the extraordinary power of a Turing machine."
