Valmiki Ramayana Sundara Kanda Sarga 68 Shloka 19

येषाम् all of them, गतिः can go, उपरि in the sky, न सज्जते not obstructed, अधस्तात् in the underworld, न not, तिर्यक् obliquely, न not, अमिततेजसः very brilliant, महत्सु very great, कर्मसु task also, न सीदन्ति without any difficulty.

'All of them can go upward in the sky, downward into the underworld or obliquely in any direction without obstruction. They are brilliant enough to do any great task without any difficulty.