Brihat Samhita
उदये च मुनेरगस्त्यनाम्नः कुसमायोगमलप्रदूषितानि । हृदयानि सतां इव स्वभावात्पुनरम्बूनि भवन्ति निर्मलानि ॥ १२-०७ ॥
When star Canopus reappears after its conjunction with the Sun, waters muddled by their contact with the earth will resume their original clearness just in the same way as the minds of the Sādhus naturally recover their original purity after contact with the wicked.
english translation
udaye ca muneragastyanAmnaH kusamAyogamalapradUSitAni । hRdayAni satAM iva svabhAvAtpunarambUni bhavanti nirmalAni ॥ 12-07 ॥
hk transliteration by Sanscript