In youth it is the outward ...

In youth it is the outward aspect of things that most engages us; while in age, thought or reflection is the predominating qualityof the mind. Hence, youth is the time for poetry, and age is more inclined to philosophy. In practical affairs it is the same: a man shapes his resolutions in youth more by the impression that the outward world makes upon him; whereas, when he is old, it is thought that determines his actions.
In youth it is the outward aspect of things that most engages us; while in age, thought or reflection is the predominating qualityof the mind. Hence, youth is the time for poetry, and age is more inclined to philosophy. In practical affairs it is the same: a man shapes his resolutions in youth more by the impression that the outward world makes upon him; whereas, when he is old, it is thought that determines his actions.
 Arthur Schopenhauer

Quotes from the same author

Every man takes the limits of his own field of vision for the limits of the world.
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 Arthur Schopenhauer
In action a great heart is the chief qualification. In work, a great head.
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 Arthur Schopenhauer
If children were brought into the world by an act of pure reason alone, would the human race continue to exist? Would not a man rather have so much sympathy with the coming generation as to spare it the burden of existence, or at any rate not take it upon himself to impose that burden upon it in cold blood?
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 Arthur Schopenhauer
A man of business will often deceive you without the slightest scruple, but he will absolutely refuse to commit a theft.
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 Arthur Schopenhauer
The first forty years of life give us the text; the next thirty supply the commentary on it.
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 Arthur Schopenhauer