We frequently fall into error ...

We frequently fall into error and folly, not because the true principles of action are not known, but because for a time they are not remembered; he may, therefore, justly be numbered among the benefactors of mankind who contracts the great rules of life into short sentences that may early be impressed on the memory, and taught by frequent recollection to occur habitually to the mind.
We frequently fall into error and folly, not because the true principles of action are not known, but because for a time they are not remembered; he may, therefore, justly be numbered among the benefactors of mankind who contracts the great rules of life into short sentences that may early be impressed on the memory, and taught by frequent recollection to occur habitually to the mind.
 Samuel Johnson

Quotes from the same author

If a man does not make new acquaintances as he advances through life, he will soon find himself left alone. A man, sir, should keep his friendship in a constant repair.
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 Samuel Johnson
To keep your secret is wisdom; but to expect others to keep it is folly.
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 Samuel Johnson
Love is the wisdom of the fool and the folly of the wise.
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 Samuel Johnson
Memory is the mother of all wisdom.
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 Samuel Johnson
Friendship, like love, is destroyed by long absence, though it may be increased by short intermissions.
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 Samuel Johnson