Your definition of morality must be then something like that. Some people attempt at attaining that high and difficult knowledge by the exercise of reasoning. Many persons maintain, on the other hand, that morality can be learned from the scriptures alone.
तत्र ते लक्षणोद्देशः कश्चिदेवं भविष्यति॥ दुष्करं परमं ज्ञानं तर्केणानुव्यवस्यति। श्रुतेधर्म इति वदन्ति बहवो जनाः॥