This fact is central and special in our Vedic Relegion and to its eternal character.

The moral and ethical ordinances in other religions are applicable to all their followers. In Hinduism too there is a code of conduct meant for all varnas and all jatis. But in addition to this, there are separate dharmas for jatis with different vocations. There is no intermingling of these vocations and their corresponding dharmas. This fact is central to Hinduism and to its eternal character.
This religion has flourished for countless eons. What is the reason for its extraordinarily long history. If Hinduism has survived so long it must be due to some quality unique to it, something that gives it support and keeps it going. No other religion is known to have lasted so long. When I think of our religion I am reminded of our temples. They are not kept as clean as churches or mosques. The latter are frequently whitewashed. There are so many plants sprouting from the gopurams and our temples support all of them. The places of worship of other religions have to be repaired every two or three years. Our sanctuaries are different because they are built of granite. Their foundations, laid thousands of years ago, still remain sturdy. That is why our temples have lasted so long without the need for frequent repair. We do so much to damage them and are even guilty of acts of sacrilege against them, but they withstand all the abuses. All are agreed that India has the most ancient temples. People come from abroad to take photographs of them. These temples still stand as great monuments to our civilization in spite of our neglect of them and our indifference. It is not easy to pull them down. Perhaps it is more difficult to demolish these edifices than it must have been to build them.
Our religion to repeat is like these temples. It is being supported by something that we do not seem to know, something that is not present in other faiths. It is because of this "something" that in spite of all the differences, it is still alive.
This something is varnasrama dharma. In other religions there is a common dharma for all and we think that that is the reason for their greatness. These religions seem to touch the heights of glory at one time but at other times they are laid low. Christianity supplanted Buddhism in some countries. Islam replaced Christianity or Christianity replaced Islam. We know these developments as historical facts. The civilizations and religions that evolved in ancient Greece and China no longer exist today. Hinduism is the witness to all such changes in other religions and it is subject to attacks from inside and outside. Yet it lives-it refuses to die.
There was a palm-tree round which a creeper entwined itself. The creeper grew fast and within months it entwined the entire tree. "This palm has not grown a bit all these months", the creeper said laughing. The palm-tree retorted: "I have seen ten thousand creepers in my life. Each creeper before you said the same thing as you have now said. I don't know what to say to you." Our religion is like tree in relations to all other faiths.
Although there are separate duties and religious rites for the different castes in our religion, the fruit of the rites are same for all. 

By Sri Chandrasekhara Paramacharya Swamy