Well, that is one of the three foundations of learning: see much, study much, suffer much.

Our youth education is based on three pillars: belief, science and work.

It is here, I think, that the most important phase of education appears, in the capacity to learn from each thing you see, from each fact you acquire, from each experience you have, from each person you meet. And nothing you learn, however wide of the mark it may appear at the time, however trivial, is ever wasted. In all my life, nothing I have ever learned has failed to be useful to me at some time or other, often in the most unexpected way and in some quite unforeseen context.

Education...is a painful, continual and difficult work to be done in kindness, by watching, by warning,... by praise, but above all — by example.

Learning comes through pain.

Suffering is an excellent teacher, and Aeschylus says, "We learn by sufferings. "We are easily] up; sufferings keep us humble. We easily turn to worldly things. Sufferings make us turn to ( love ourselves; sufferings teach us to love God."

Some lessons are painful, some are painless.. but, all are priceless.

To learn hard things quickly, you must focus intensely without distraction. To learn, in other words, is an act of deep work.

What is learned out of necessity is inevitably more powerful than the learning that comes easily.

The masses, the army, and the cadres are the three pillars on which we rely.

Eyes dripping blue, so much to learn.

To suffer is to produce knowledge.

Sertillanges argues that to advance your understanding of your field you must tackle the relevant topics systematically, allowing your “converging rays of attention” to uncover the truth latent in each. In other words, he teaches: To learn requires intense concentration.

He who learns must suffer' and that 'against our will comes wisdom through the awful grace' of enduring pain...