There are two types of knowledge. One is knowing a thing. The other is knowing where to find it.

To understand the works of celebrated authors, to comprehend their systems, and retain their reasonings, is a task more than equal to common intellects; and he is by no means to be accounted useless or idle, who has stored his mind with acquired knowledge, and can detail it occasionally to others who have less leisure or weaker abilities.

Criticism is a study by which men grow important and formidable at very small expense. The power of invention has been conferred by nature upon few, and the labour of learning those sciences which may, by mere labour, be obtained, is too great to be willingly endured; but every man can exert some judgment as he has upon the works of others; and he whom nature has made weak, and idleness keeps ignorant, may yet support his vanity by the name of critic.

The chief art of learning, as Locke has observed, is to attempt but little at a time. The widest excursions of the mind are made by short flights frequently repeated; the most lofty fabrics of science are formed by the continued accumulation of single propositions.

Curiosity is, in great and generous minds, the first passion and the last; and perhaps always predominates in proportion to the strength of the contemplative faculties. He who easily comprehends all that is before him, and soon exhausts any single subject, is always eager for new inquiries; and in proportion as the intellectual eye takes in a wider prospect, it must be gratified with variety, by more rapid flights and bolder excursions.

The labor of rising from the ground will be great, ... but as we mount higher, the earth's attraction, and the body's gravity, will be gradually diminished till we arrive at a region where the man will float in the air without any tendency to fall.

What is written without effort is in general read without pleasure.