“There are two kinds of people in the world, whom we might dub the jobholders and the enthusiasts.”
Preface.
A History of Science Vol.1 Ancient Science Through the Golden Age of Greece (1952)
Context: There are two kinds of people in the world, whom we might dub the jobholders and the enthusiasts.... The majority of the kings and emperors were jobholders and so were many of the popes.... Most of the creators in the field of art and religion, and many of them in the field of science, were enthusiasts. Now economic conditions may deeply affect the jobs and the jobholders, but they make little impression on the enthusiasts.... the jobholders... keep things going with enough continuity and smoothness; they are the builders of usages and customs, the defenders of morality and justice.... the enthusiasts... are the main instruments of change and progress; they are the real creators and troublemakers. The enthusiasts are the salt of the earth, but man cannot live by salt alone.
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George Sarton 33
American historian of science 1884–1956Related quotes

Vanity Fair (February 1920)
Variant: There may be said to be two classes of people in the world; those who constantly divide the people of the world into two classes, and those who do not.
Context: There may be said to be two classes of people in the world; those who constantly divide the people of the world into two classes, and those who do not. Both classes are extremely unpleasant to meet socially, leaving practically no one in the world whom one cares very much to know.

“There are two kinds of people in the world, observers and non-observers…”
Source: Travels with Charley: In Search of America

Source: The Great Divorce (1944–1945), Ch. 9, p. 72; part of this has also been rendered in a variant form, and quoted as:
Context: 'But what of the poor Ghosts who never get into the omnibus at all?'
'Everyone who wishes it does. Never fear. There are only two kinds of people in the end: those who say to God, "Thy will be done," and those to whom God says, in the end, "Thy will be done." All that are in Hell, choose it. Without that self-choice there could be no Hell. No soul that seriously and constantly desires joy will ever miss it. Those who seek find. To those who knock it is opened.'

Vanity Fair (February 1920)
Source: https://quoteinvestigator.com/2014/02/07/two-classes/

"There are Two Seas" http://www.ciadvertising.org/student_account/spring_01/adv382j/suz/two_seas.htm, McCall's magazine (1928); reprinted in the Reader's Digest (1946)
Context: There are two seas in Palestine. One is fresh, and fish are in it. Splashes of green adorn its banks. Trees spread their branches over it and stretch out their thirsty roots to sip of its healing waters... The Sea of Galilee receives but does not keep the Jordan. For every drop that flows into it another drop flows out. The giving and receiving go on in equal measure. The other sea is shrewder, hoarding its income jealously. It will not be tempted into any generous impulse. Every drop it gets, it keeps. The Sea of Galilee gives and lives. The other sea gives nothing. It is named The Dead. There are two kinds of people in the world. There are two seas in Palestine.