• Noun: anything indispensable; examples: "food and shelter are necessities of life", "the essentials of the good life", "allow farmers to buy their requirements under favorable conditions", "a place where the requisites of water fuel and fodder can be obtained"
• Adj: absolutely essential
• Adj: unavoidably determined by prior circumstances; example: "the necessary consequences of one's actions"
There are no mistakes. The events we bring upon ourselves, no matter how unpleasant, are necessary in order to learn what we need to learn; whatever steps we take, they're necessary to reach the places we've chosen to go.
Allow the president to invade a neighboring nation, whenever he shall deem it necessary to repel an invasion, and you allow him to do so whenever he may choose to say he deems it necessary for such a purpose - and you allow him to make war at pleasure.
The fact that political ideologies are tangible realities is not a proof of their vitally necessary character. The bubonic plague was an extraordinarily powerful social reality, but no one would have regarded it as vitally necessary.
What is government itself but the greatest of all reflections on human nature? If men were angels, no government would be necessary. If angels were to govern men, neither external nor internal controls on government would be necessary.