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151
There is, however, a true Music of Nature,--the song of birds, the whisper of leaves, the ripple of waters upon a sandy shore, the wail of wind or sea.
153
In short, children should be trained to observe and to think, for in that way there would be opened out to them a source of the purest enjoyment for leisure hours, and the wisest judgment in the work of life.
160
After listening to it in all kinds of winds, night and day, season after season, I think I could approximate to my position on the mountains by this pine-music alone.
161
The most respectful deference is due to doubts originating in pure patriotism and sustained by venerated authority.
John Quincy AdamsverifiedInaugural Address·March 4, 1825
163
To refuse a hearing to an opinion, because they are sure that it is false, is to assume that their certainty is the same thing as absolute certainty.
164
No man can reveal to you aught but that which already lies half asleep in the dawning of your knowledge.
Kahlil GibranverifiedThe Prophet·1923
165
Say not, “I have found the truth,” but rather, “I have found a truth.”
Kahlil GibranverifiedThe Prophet·1923
169
These possibilities of mental development are still further increased when the man makes his own records. This leads to closer attention, to more interest in the work, and to a realization of the man as to what the record really means, and what value it represents.
173
The fundamental principle of scientific pedagogy must be, indeed, the liberty of the pupil;--such liberty as shall permit a development of individual, spontaneous manifestations of the child's nature.
174
And yet, in spite of the opposition encountered, and the obstacles opposed to their acquisition of knowledge and their accumulation of property, the progress made by colored women along these lines has never been surpassed by that of any people in the history of the world.

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