Words 'Sanatan Dharma' find highly respectable place in Bauddha tradition and philosophy. Another synonym used in Bauddha texts is "poranako dhammo" (Pauranik Dharma or The Old/Established Law)
In Yamakavagga chapter of DharmaPad (Dhammpada), the fifth verse uses the words "dhammo sanantano". In this, Bhagvan Gautama Buddha says:
Na hi verena verani, sammantidha kudacanam
averena ca sammanti, esa <span style='font-size:14pt;line-height:100%'>dhammo sanantano</span>
(DP, Yamakavagga, 5)
Rough translation: "hatred is never appeased by hatred in this world. It is treated only by loving-kindness. Such is the ancient law, sanatana dharma."
There is a story behind this saying of Buddha, known as "Kalayakkhini Katha".
Once there lived a householder, whose wife was barren; later he took another wife. The feud started when the elder wife caused abortion of the other one, who eventually died in child birth. In later existences the two were reborn as a hen and a cat; a doe and a leopardess; and finally as the daughter of a nobleman in Savatthi and an ogress named Kali. The ogress (Kalayakkhini) was in hot pursuit of the lady with the baby, when the latter learned that the Buddha was nearby, giving a religious discourse at the Jetavana monastery in the city of Savatthi (today Shravasti in Uttar Pradesh).
She fled to him and placed her son at his feet for protection. The ogress was stopped at the door by the guardian spirit of the monastery and was refused admission. She was later called in and both the lady and the ogress were reprimanded by Buddha. Buddha told them about their past feuds as rival wives of a common husband, as a cat and a hen, and as a doe and a leopardess. They were made to see that hatred could only cause more hatred, and that it could only cease through friendship, understanding and goodwill.
Then the Buddha spoke the above verse, and explained the principles of Karma as the prime law of Sanatana Dharma, and principles of Hatred. At the end of the discourse, the ogress was established in Sotapatti Fruition and the long-standing feud came to an end.
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added later:
This particular part of Dhammpada exactly agrees with the recommendation of Bhagvan Patanjali as in Yog Darshan, about the cure of 'Dwesha Bhav'- which is treating the subject of hatred through our Vipreet Bhava of "Maitri-Karuna-Mudita-Udaseen-Upekshya Bhava" - Friendship-Mercy-Goodwill-Indifference-Ignoring - sentiments preferrable in the same order.
In Yamakavagga chapter of DharmaPad (Dhammpada), the fifth verse uses the words "dhammo sanantano". In this, Bhagvan Gautama Buddha says:
Na hi verena verani, sammantidha kudacanam
averena ca sammanti, esa <span style='font-size:14pt;line-height:100%'>dhammo sanantano</span>
(DP, Yamakavagga, 5)
Rough translation: "hatred is never appeased by hatred in this world. It is treated only by loving-kindness. Such is the ancient law, sanatana dharma."
There is a story behind this saying of Buddha, known as "Kalayakkhini Katha".
Once there lived a householder, whose wife was barren; later he took another wife. The feud started when the elder wife caused abortion of the other one, who eventually died in child birth. In later existences the two were reborn as a hen and a cat; a doe and a leopardess; and finally as the daughter of a nobleman in Savatthi and an ogress named Kali. The ogress (Kalayakkhini) was in hot pursuit of the lady with the baby, when the latter learned that the Buddha was nearby, giving a religious discourse at the Jetavana monastery in the city of Savatthi (today Shravasti in Uttar Pradesh).
She fled to him and placed her son at his feet for protection. The ogress was stopped at the door by the guardian spirit of the monastery and was refused admission. She was later called in and both the lady and the ogress were reprimanded by Buddha. Buddha told them about their past feuds as rival wives of a common husband, as a cat and a hen, and as a doe and a leopardess. They were made to see that hatred could only cause more hatred, and that it could only cease through friendship, understanding and goodwill.
Then the Buddha spoke the above verse, and explained the principles of Karma as the prime law of Sanatana Dharma, and principles of Hatred. At the end of the discourse, the ogress was established in Sotapatti Fruition and the long-standing feud came to an end.
----
added later:
This particular part of Dhammpada exactly agrees with the recommendation of Bhagvan Patanjali as in Yog Darshan, about the cure of 'Dwesha Bhav'- which is treating the subject of hatred through our Vipreet Bhava of "Maitri-Karuna-Mudita-Udaseen-Upekshya Bhava" - Friendship-Mercy-Goodwill-Indifference-Ignoring - sentiments preferrable in the same order.