vedyog.net

In English:

Swami Dayanand Saraswati Commentary : The Vedic conduct of truthful men that has been followed from the beginning of the creation till today, i.e., in which the practice of truth alone is done, and untruth has been given up, is called ‘Truthful Conduct’.

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In Hindi:

महर्षि दयानन्द व्याख्या : जो सृष्टि से लेकर आज पर्यन्त सत्पुरुषों का वेदोक्त आचार चला आया है, कि जिसमें सत्य का ही आचरण और असत्य का परित्याग किया है, उसको 'सदाचार' कहते हैं ।