One's own free unfettered ...

One\'s own free unfettered choice, one\'s own caprice-however wild it may be, one\'s own fancy worked up at times to frenzy-is that very \
One's own free unfettered choice, one's own caprice-however wild it may be, one's own fancy worked up at times to frenzy-is that very "most advantageous advantage" which we have overlooked, which comes under no classification and against which all systems and theories are continually being shattered to atoms... [an]will attain his object-that is, convince himself he is a man and not a piano-key!
 Fyodor Dostoevsky

Quotes from the same author

Love animals: God has given them the rudiments of thought and joy untroubled. Do not trouble their joy, don't harrass them, don't deprive them of their happiness, don't work against God's intent. Man, do not pride yourself on superiority to animals; they are without sin, and you, with your greatness, defile the earth by your appearance on it, and leave the traces of your foulness after you - alas, it is true of almost every one of us!
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 Fyodor Dostoevsky
A widow, the mother of a family, and from her heart she produces chords to which my whole being responds.
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 Fyodor Dostoevsky
...to return to their 'native soil,' as they say, to the bosom, so to speak, of their mother earth, like frightened children, yearning to fall asleep on the withered bosom of their decrepit mother, and to sleep there for ever, only to escape the horrors that terrify them.
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 Fyodor Dostoevsky
God has such gladness every time he sees from heaven that a sinner is praying to Him with all his heart, as a mother has when she sees the first smile on her baby's face.
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 Fyodor Dostoevsky
There is immeasurably more left inside than what comes out in words.
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 Fyodor Dostoevsky