Scire volunt secreta domus atque inde timeri.
Juv. Sat. iii, 113.
They search the secrets of the house, and so
Are worshipp'd there, and fear'd for what they know.
Dryden.
Curiosity is one of the permanent and certain characteristicks of a vigorous intellect. Every advance into knowledge opens new prospects, and produces new incitements to further progress. All the attainments possible in our present state are evidently inadequate to our capacities of enjoyment; conquest serves no purpose but that of kindling ambition, discovery has no effect but of raising expectation; the gratification of one desire encourages another; and after all our labours, studies, and inquiries, we are continually at the same distance from the completion of our schemes, have still some wish importunate to be satisfied, and some faculty restless and turbulent for want of its enjoyment.
The desire of knowledge, though often animated by extrinsick and adventitious motives, seems on many occasions to operate without subordination to any other principle; we are eager to see and hear, without intention of referring our observations to a farther end; we climb a mountain for a prospect of the plain; we run to the strand in a storm, that we may contemplate the agitation of the water; we range from city to city, though we profess neither architecture nor fortification; we cross seas only to view nature in nakedness, or magnificence in ruins; we are equally allured by novelty of every kind, by a desert or a palace, a cataract or a cavern, by every thing rude and every thing polished, every thing great and every thing little; we do not see a thicket but with some temptation to enter it, nor remark an insect flying before us but with an inclination to pursue it.
This passion is, perhaps, regularly heightened in proportion as the powers of the mind are elevated and enlarged. Lucan therefore introduces Cæsar speaking with dignity suitable to the grandeur of his designs and the extent of his capacity, when he declares to the high-priest of Egypt, that he has no desire equally powerful with that of finding the origin of the Nile, and that he would quit all the projects of the civil war for a sight of those fountains which had been so long concealed. And Homer, when he would furnish the Sirens with a temptation, to which his hero, renowned for wisdom, might yield without disgrace, makes them declare, that none ever departed from them but with increase of knowledge.
There is, indeed, scarce any kind of ideal acquirement which may not be applied to some use, or which may not at least gratify pride with occasional superiority; but whoever attends the motions of his own mind will find, that upon the first appearance of an object, or the first start of a question, his inclination to a nearer view, or more accurate discussion, precedes all thoughts of profit, or of competition; and that his desires take wing by instantaneous impulse, though their flight may be invigorated, or their efforts renewed, by subsequent considerations. The gratification of curiosity rather frees us from uneasiness than confers pleasure; we are more pained by ignorance, than delighted by instruction. Curiosity is the thirst of the soul; it inflames and torments us, and makes us taste every thing with joy, however otherwise insipid, by which it may be quenched.
It is evident that the earliest searchers after knowledge must have proposed knowledge only as their reward; and that science, though perhaps the nursling of interest, was the daughter of curiosity: for who can believe that they who first watched the course of the stars, foresaw the use of their discoveries to the facilitation of commerce, or the mensuration of time? They were delighted with the splendour of the nocturnal skies, they found that the lights changed their places; what they admired they were anxious to understand, and in time traced their revolutions.