Quotes from book
The Protestant Ethic and the Spirit of Capitalism

The Protestant Ethic and the Spirit of Capitalism is a book written by Max Weber, a German sociologist, economist, and politician. Begun as a series of essays, the original German text was composed in 1904 and 1905, and was translated into English for the first time by American sociologist Talcott Parsons in 1930. It is considered a founding text in economic sociology and a milestone contribution to sociological thought in general.

“"Rationalism" is a historical concept that contains within itself a world of contradictions.”
Source: The Protestant Ethic and the Spirit of Capitalism (1905; 1920), Ch. 2 : The "Spirit" of Capitalism

This tendency has not been observed in the same way in the present or the past among Catholics, regardless of whether they were the dominant or dominated stratum or constituted a majority or minority. Therefore the cause of the different behavior must be mainly sought in the enduring inner quality of these religions and not only in their respective historical-political external situations.
Source: The Protestant Ethic and the Spirit of Capitalism (1905; 1920), Ch. 1 : Religious Affiliation and Social Stratification