If Socialism can only be realized when the intellectual development of all the people permits it, then we shall not see Socialism for at least five hundred years.
One moment you appear to be riding the crest of a wave, only to have the rug pulled away from you, bringing you back down to earth with a sickening thud.
If you're unable to catch it in time, the cancer can spread to the lymph nodes and at that point, the cancer is essentially incurable, but that doesn't mean your condition can't be improved.

