Valmiki Ramayana Yuddha Kanda Sarga 88 Shloka 13

राक्षस Rakshasa, त्यया your, कार्याणाम् undertakings, दुर्गमः difficult, पारः proclaimed, उक्तश्च have spoken, यः that which, कार्याणा undertakings, कर्मणाम् tasks, पारम् to the abode of Yama, गच्छति will go, सः he who is, बुद्धिमान् intelligent one

"Rakshasa! You have proclaimed that you will send me to Yama's abode and about the success in your undertakings even though it is not possible. He who is intelligent will succeed in his tasks (not in words alone).