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From latin principĭum, the principle, in the literary sense, is the cause of something, which is at the origin. It is a synonym of beginning and beginning. For example: "God is the principle and the end of all things", "From the principle, I immediately loved this book!", "this work is, in principle, that an imitation of art deco except with a touch of romanticism".
Principle is also the point which is considered the first in an extension, the origin or cause of something and the fundamental reason or base on which rests a material or a given subject: "the principle of the financial crisis should the crisis of the mortgages in the USA", "losing my job was that the principle of the debacle ": eventually, I had to sell my car and has come to liquidate my house."
The principle concept has to do, on the other hand, with proposals or fundamental assumptions which form the basis of study of the sciences or the arts, and with the fundamental rules defining the reasoning and way of acting: "the universal law of gravitation is one of the principles of Physics", "I refuse to work in a business that harms the environment. «: this would indeed go against my principles ","my grandfather is a man of principles who always keeps his word.»
The principle as a moral stance is a value that helps define the mode of action of a following person what his conscience tells him. It is question of individual liberty, given that the principle is fixed without external constraint, even if he was influenced by the socialization process.
Finally, the active principle (also called active substance) is a compound extracted from a plant or animal substance or simply all components of a medicinal product or a product (cream, serum, etc) which has a therapeutic effect.