SB 11.25.19
edhamane gune sattve
devanam balam edhate
asuranam ca rajasi
tamasy uddhava raksasam
Translation:
With the increase of the mode of goodness, the strength of the demigods similarly increases. When passion increases, the demoniac become strong. And with the rise of ignorance, O Uddhava, the strength of the most wicked increases.