I have tried hard - but life is difficult, and I am a very useless person. I can hardly be said to have an independent existence. I was just a screw or a cog in the great machine called life, and when I dropped out of it I found I was no use anywhere else. What can one do when one finds out that one only fits into one hole? One must go back to it or be thrown out into the rubbish heap - and you don't know what it's like in the rubbish heap!
Edith Wharton, The House of Mirth
cog, life-and-living, rubbish-heap