Bhashya
यो ह वै वसिष्ठां वेद वसिष्ठः स्वानां भवति ।तद्दर्शनानु-रूपेण फलम् ।येषां च ज्ञातिव्यतिरेकेण वसिष्ठो भवितुमि-च्छति, तेषां च वसिष्ठो भवति ।उच्यतां तर्हि, कासौवसिष्ठेति ; वाग्वै वसिष्ठा ; वासयत्यतिशयेन वस्ते वेतिवसिष्ठा ; वाग्ग्मनो हि धनवन्तो वसन्त्यतिशयेन ; आच्छा-दनार्थस्य वा वसेर्वसिष्ठा, अभिभवन्ति हि वाचा वाग्ग्म-नः अन्यान् ।तेन वसिष्ठगुणवत्परिज्ञानात् वसिष्ठगुणो भ-वतीति दर्शनानुरूपं फलम् ॥
In plain words
Whoever truly knows Vasiṣṭhā becomes the most excellent among his own people — the reward always matches the insight. And it isn't limited to blood relations: whoever else you wanted to surpass, you surpass them too. So what, then, is this Vasiṣṭhā? Speech itself is Vasiṣṭhā — called that because she makes wealth settle in abundantly, or because she herself dwells in abundance; after all, people gifted with speech grow wealthy and live in plenty. Or perhaps the name comes from a root meaning 'to cover,' since the eloquent overpower everyone else simply through what they say. Either way, knowing fully what it means to possess this quality is what makes the quality your own — the reward, once again, matches exactly what was seen.
Close to the Sanskrit
He who indeed knows Vasiṣṭhā becomes the most excellent among his own people; the fruit is in conformity with that vision. And with respect to whomever, apart from mere kinship, one wishes to become the most excellent, with respect to them too he becomes the most excellent. Let it then be asked: what is this Vasiṣṭhā? Speech, verily, is Vasiṣṭhā; she is called Vasiṣṭhā because she makes [wealth] dwell exceedingly, or because she dwells [in abundance] — thus Vasiṣṭhā; for the eloquent, being wealthy, dwell in exceeding abundance. Or Vasiṣṭhā is named from the root vas in the sense of 'covering,' for the eloquent overpower others, indeed, by speech. Therefore, from the full knowledge of one possessing the quality of Vasiṣṭhā, the quality of Vasiṣṭhā arises — thus the fruit is in conformity with the vision.