The beginnings of Hagiology itself are very uncertain: but what is certain is that they are very early: and that as the amalgamation or leavening of the Roman world with barbarian material proceeded, the spread of Christianity proceeded likewise.
"The English Novel"
George Saintsbury
Nor did the lump need the leavening of the large percentage of men of the upper classes who served as privates, some of them from the beginning to the end of the war.
"The Creed of the Old South 1865-1915"
Basil L. Gildersleeve
Consideration leads to sympathy, and sympathy wonderfully quickens the inventive faculties; and the aroused intellect and active affection are leavening forces that alter social conditions always for the better.
"White Slaves"
Louis A Banks