Valmiki Ramayana Ayodhya Kanda Sarga 21 Shloka 39

शुभलक्षण O one of auspicious qualities (Lakshmana), सत्यस्य च of truth, शमस्य च of selfrestraint, अभिप्रायम् the meaning, अविज्ञाय without realising, मम मातुः my mother's, अतुलम् incomparable, महत् दुःखम् great grief.

O Lakshamana of auspicious qualities, since my mother is not aware of the significance of truth and selfrestraint, she is overcome with grief, great and incomparable.