Valmiki Ramayana Sundara Kanda Sarga 11 Shloka 41
Original Shlokaमनो हि हेतुः सर्वेषामिन्द्रियाणां प्रवर्तने।।5.11.41।। शुभाशुभास्ववस्थासु तच्च मे सुव्यवस्थितम्।
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शुभाशुभासु for good and bad, अवस्थासु in all stages, सर्वेषाम् for all, इन्द्रियाणाम् of sense organs, प्रवर्तने in reaction, मनः mind, हेतुः is instrumental, मे my, तच्च that also, सुव्यवस्थितम् is firmly eastablished.
'Mind propels the sense organs to do good or bad deeds. (But) my mind is firmly esatablished in righteousness'.