The numbers following the quotations indicate the paragraph numbers of the encyclical. (faith.org.uk)
Whitehead then shows the distinction even more strongly in the lines which follow this quotation, allowing, in effect, that the same proposition could possibly make up the content of contradictory judgments. (religion-online.org)
I remember in my days as a typesetter in Germany, we always inserted a narrow space following quotation marks, and also set apart things, such as exclamation marks with some narrow spacing. (guidohenkel.com)