Arthashastra
मन्त्र शक्ति सम्पन्नो हि वन्ध्य बुद्धिर् अप्रभावो भवति ॥
for a king, though possessed of skill for intrigue (mantrasakti) becomes a man of barren mind if he has no power; for the work of intrigue is well defined.
english translation
mantra zakti sampanno hi vandhya buddhir aprabhAvo bhavati ॥
hk transliteration by Sanscript