of equal force

References in classic literature ?
if the victory has not remained with me, it is the fault of God, who has not created man and the demon of equal force.
Dollop, the spirited landlady of the Tankard in Slaughter Lane, who had often to resist the shallow pragmatism of customers disposed to think that their reports from the outer world were of equal force with what had "come up" in her mind.
Here Sluijter asserts that although a notion of the artist as an Apelles, inspired by his desire and love for his model to produce beautiful art, had currency in Rembrandt's Holland, of equal force were broad cultural concerns about the erotic charge inherent in images of the female nude.