It is not difficult to ...

It is not difficult to conceive, however, that for many reasons a man writes much better than he lives. For without entering into refined speculations, it may be shown much easier to design than to perform. A man proposes his schemes of life in a state of abstraction and disengagement, exempt from the enticements of hope, the solicitations of affection, the importunities of appetite, or the depressions of fear.
It is not difficult to conceive, however, that for many reasons a man writes much better than he lives. For without entering into refined speculations, it may be shown much easier to design than to perform. A man proposes his schemes of life in a state of abstraction and disengagement, exempt from the enticements of hope, the solicitations of affection, the importunities of appetite, or the depressions of fear.

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.
To keep your secret is wisdom; but to expect others to keep it is folly.
Love is the wisdom of the fool and the folly of the wise.
Memory is the mother of all wisdom.
Friendship, like love, is destroyed by long absence, though it may be increased by short intermissions.