Valmiki Ramayana Ayodhya Kanda Sarga 109 Shloka 19

अहम् I, स्वयम् personally, इमम् this, सत्यं धर्मम् righteousness in the form of truth, प्रत्यगात्मम् as supreme self, पश्यामि I perceive (consider), तदर्थम् hence, सत्पुरुषाचीर्णः practised by the virtuous, भारः this burden (of exile into the forest), अभिमन्यते I consider.

I personally regard this righteousness practised by the virtuous as an evident form of truth, as the supreme self. Therefore, this burden (difficult task of living as an exile) is gratifying to me.