ये हि वृत्तिं विजानन्ति ज्ञात्वापि वर्धयन्ति ये ।ते वै सत्पुरुषा धन्या वन्द्यास्ते भुवनत्रये ॥ १३१ ॥
In plain words
Those who actually recognize this vṛtti — and having recognized it, keep feeding it so it grows — they are the real ones, the fortunate ones. In all three worlds, they are the ones to bow to.
Close to the Sanskrit
Those who indeed know this vṛtti, and who, having known it, also make it grow — they truly are real persons, blessed; they are worthy of reverence in the three worlds.