In all things, success depends upon previous preparation without which there is sure to be failure.
Learning without thought is labour lost; thought without learning is perilous.
I am not one who was born in the possession of knowledge; I am one who is fond of antiquity, and earnest in seeking it there.
Study the past if you would define the future.
I hear and I forget. I see and I remember. I do and I understand.
To learn and, from time to time, to apply what one has learned, isn't that a pleasure.