Through the power of his penance and through the grace of God has the wise Svetasvatara truly proclaimed Brahman, the highest and holiest, to the best of ascetics, as approved by the company of Rishis.

In plain words: The wise sage Shvetashvatara, through his hard spiritual discipline and by God's grace, taught this highest and holiest truth about Brahman, the ultimate reality. He taught it to the most dedicated seekers, and the gathered sages approved it.