not to find out new principles, or new arguments, never before thought of . . . but to place before mankind the common sense of the subject, in terms so plain and firm as to command their assent, and to justify ourselves in the independent stand we are compelled to take.
Interpretation
The quote emphasizes the importance of presenting common sense clearly to gain acceptance and justify one's stance.
In this quote, Thomas Jefferson asserts that the goal isn't necessarily to discover new ideas or arguments, but rather to present existing knowledge and truths in a manner that is clear and convincing. He believes that by articulating common sense effectively, individuals can earn the approval of others and support their independent beliefs and decisions.
In practice
During a debate, you could use this quote to emphasize the value of presenting clear arguments.
The firmness with which the (American) people have withstood the... abuses of the press, the discernment they have manifested between truth and falsehood, show that they may safely be trusted to hear everything true and false and to form a correct judgment between them.
I, place economy among the first & most important republican virtues, & public debt as the greatest of the dangers to be feared
We must make our choice between economy and liberty or confusion and servitude...If we run into such debts, we must be taxed in our meat and drink, in our necessities and comforts, in our labor and in our amusements...if we can prevent the government from wasting the labor of the people, under the pretense of caring for them, they will be happy.
Very many and very meritorious were the worthy patriots who assisted in bringing back our government to its republican tack. To preserve it in that, will require unremitting vigilance.
A nation, as a society, forms a moral person, and every member of it is personally responsible for his society.
Timid men prefer the calm of despotism to the tempestuous sea of liberty.
To me, every hour of the light and dark is a miracle, every inch of space is a miracle, every square yard of the surface of the earth is spread with the same, every cubic foot of the interior swarms with the same; every spear of grass-the frames, limbs, organs, of men and women, and all that concerns them, all these to me are unspeakably perfect miracles.
Terrorism is a persistent and evolving global menace. No country is immune.
My mother would write letters when I was away at camp and say, 'There's an Ann-shaped space around the house. Nobody fills an Ann-shaped space except an Ann.' I'm convinced we all have a God-shaped space in us, and until we fill that space with God, we'll never know what it is to be whole.
Wars of aggression are popular nowadays with those nations convinced that only victory and conquest could improve their material well-being.
Although sometimes the morbid is also the transcendent, the transcendent cannot be reduced to the morbid.
An old joke has an Oxford professor meeting an American former graduate student and asking him what he's working on these days. 'My thesis is on the survival of the class system in the United States.' 'Oh really, that's interesting: one didn't think there was a class system in the United States.' 'Nobody does. That's how it survives.
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