Two Kinds of Strength

The soldiers Lord Ramacandra recruited in the jungle were all monkeys and did not have proper equipment with which to fight the soldiers of Ravana, for Ravana's soldiers were equipped with weapons of modern warfare whereas the monkeys could only throw stones, mountain peaks and trees. It was only Lord Ramacandra and Laksmana who shot some arrows. But because the soldiers of Ravana were condemned by the curse of mother Sita, the monkeys were able to kill them simply by throwing stones and trees. There are two kinds of strength—daiva and purusakara. Daiva refers to the strength achieved from the Transcendence, and purusakara refers to the strength organized by one's own intelligence and power. Transcendental power is always superior to the power of the materialist.
From purport to Srimad Bhagavatam 9.10.20