"Sanatana means Eternal. In its purest form, this religion is Sanatana, because it is based on Truth. Truth is immortal and is never annihilated. It remains the same yesterday, today and forever. Therefore our true Sanatana Dharma, in its purest form, cam never be exterminated. It, however, does not follow that we should relax into inaction, in the belief that our religion is the best or that it can never be destroyed. No, no. This idle thinking is the result of our indolent minds. It is, therefore, absolutely essential for the followers of Sanatana Dharma to keep it safe from the evil and aggressive designs of the non-Hindus, who are generally ever ready to malign us."
January 1, 1970
https://en.wikiquote.org/wiki/Rama_Tirtha