Thirukkural-On Avoiding Vulgarity-Kural-457

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Purity of mind ushers in spiritual growth and personal prosperity
While good associations lead to glory.

If the internal quality of 'Mananalam' 'purity of heart" and the external quality of 'Inanalam' 'Purity of association", exist together in a prince, he will be absolutely sure of a prosperous and glorious reign.

Part of the prosperity that goes with purity of the heart is also 'Moksha" according to the Bhagawad Geetha.

In the Sermon on the Mount the corresponding statement is:

“Blessed are the pure in spirit
for they shall see God"