"The most ignorant are the most conceited. Unless a man knows that there is something more to be known, his inference is, of course, that he knows every thing. Such a man always usurps the throne of universal knowledge, and assumes the right of deciding all possible questions. We all know that a conceited dunce will decide questions extemporaneous which would puzzle a college of philosophers, or a bench of judges. Ignorant and shallow-minded men do not see far enough to see the difficulty. But let a man know that there are things to be known, of which he is ignorant, and it is so much carved out of his domain of universal knowledge. And for all purposes of individual character, as well as of social usefulness, it is quite as important for a man to know the extent of his own ignorance as it is to know any thing else. To know how much there is that we do not know, is one of the most valuable parts of our attainments; for such knowledge becomes both a lesson of humility and a stimulus to exertion."

“Lawrence A. Cremin, Horace Mann, Encyclopaedia Britannica.”

“Forts, arsenals, garrisons, armies, navies, are means of security and defence, which were invented in half-civilized times and in feudal or despotic countries; but schoolhouses are the republican line of fortifications, and if they are dismantled and dilapidated, ignorance and vice will pour in their legions through every breach.”

“Resolve to edge in a little reading every day, if it is but a single sentence. If you gain fifteen minutes a day, it will make itself felt at the end of the year.”

“A human being is not attaining his full heights until he is educated.”

“He who cannot resist temptation is not a man. He is wanting in the highest attributes of humanity.”

“No matter how seemingly unconnected with human affairs or remote from human interests a newly-discovered truth may appear to be, time and genius will some day make it minister to human welfare. When Dr. Franklin was once sceptically asked what was the use of some recondite and far-off truth which had just been brought to light, "What," said he, "is the use of babies?”