Curiosity is, in great and generous minds, the first passion and the last.

Curiosity is one of the permanent and certain characteristics of a vigorous intellect.

Where necessity ends, desire and curiosity begin; and no sooner are we supplied with everything nature can demand than we sit down to contrive artificial appetites.

Among the lower classes of mankind there will be found very little desire of any other knowledge than what may contribute immediately to the relief of some pressing uneasiness, or the attainment of some near advantage.