He is real, active, the most potent factor in the daily lives of men.
"The Expositor's Bible: The Book of Exodus"
G. A. Chadwick
River-ice is often a potent agent of geological change.
"Geology"
James Geikie
The hopes of my childhood and the discouragements of my youth filled me with emotion; feelings of pleasure and sadness came as each little thought picture took definite shape; it seemed hardly possible that so many things, potent for good and bad, could have been done in so few years.
"My Attainment of the Pole"
Frederick A. Cook