Such are the vicissitudes of ...

Such are the vicissitudes of the world, through all its parts, that day and night, labor and rest, hurry and retirement, endear each other; such are the changes that keep the mind in action: we desire, we pursue, we obtain, we are satiated; we desire something else and begin a new pursuit.
Such are the vicissitudes of the world, through all its parts, that day and night, labor and rest, hurry and retirement, endear each other; such are the changes that keep the mind in action: we desire, we pursue, we obtain, we are satiated; we desire something else and begin a new pursuit.

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.