Phaladeepika
दोशप्रदाने गुलिको बलीयान् शुभप्रदाने यमकण्टकः स्यात् । अन्ये च सर्वे व्यसनप्रदाने मान्द्युक्तवीर्यर्द्धिबलान्विताः स्युः ॥ १९॥
While Gulika is very powerful in causing evil, Yamakantaka is very powerful in causing good. All the other Upagrahas possess only half the power that Mandi has in causing evil.
english translation
dozapradAne guliko balIyAn zubhapradAne yamakaNTakaH syAt । anye ca sarve vyasanapradAne mAndyuktavIryarddhibalAnvitAH syuH ॥ 19॥
hk transliteration by Sanscript