You get tired of always wanting and never being satisfied.
Honoré de Balzac (1799–1850)

Nature abhors a vacuum.
Benedict Spinoza (1632–1677)

How many souls are whirling in pleasure, in order to silence the moral griefs which torment them!
John Nelson Darby (1800–1882)

The state of man: inconstancy, boredom, anxiety.
Blaise Pascal (1623–1662)

...so, I drew away from the window, and sat down in my one chair by the bedside, feeling it very sorrowful and strange that this first night of my bright fortunes should be the loneliest I had ever known.
Charles Dickens (1812–1870)

If all our powers are wholly concentrated on outward things and there is an ever-diminishing interest in the inner life, the soul inevitably suffers. Inflated with success, we yet find ourselves empty and poor.
Rudolf Eucken (1846–1926)

If our condition were truly happy we would not have to take our minds off thinking about it in order to make ourselves happy.
Blaise Pascal (1623–1662)

Every natural longing has its natural satisfaction. If we thirst, God has created liquids to gratify thirst. If we are susceptible of attachment, there are beings to gratify that love. If we thirst for life and love eternal, it is likely that there are an eternal life and an eternal love to satisfy that craving.
Frederick William Robertson (1816–1853)

The inexorable boredom that is at the core of life.
Jacques Bénigne Bossuet (1627–1704)

Always thirsty, and with never a drop to drink, that is how I have lived for the past ten years.
Honoré de Balzac (1799–1850)