Q. All rivers flow into the ocean. But the ocean never loses its saltiness. Why is there a difference in
     taste?

All rivers have originated from the Ocean only. It is the water in the ocean that evaporates to form clouds and pour down as rain filling the rivers and seas. Energy is constant; so it cannot be otherwise.

The clouds convert the salty ocean water into potable river water. So also, a Guru transforms this miserable worldly life into a beautiful experience for you.