Divine personalities like Krishna, Buddha, Rama, Jesus and Mohamed influence the lives of millions of people for centuries. Their influence is not limited by time. Nay, it undergoes a process of time enlargement : with the passage of centuries the Flurry of these prophets, instead of decreasing, goes on increasing. Each saint or world teacher comes as the embodiment of the dominant ideal of a particular age, and his life becomes the highest moral standard and ideal for the people of that age.
Man has been continually discovering new ways of exploiting nature and improving the means of production of food, clothing, other necessities and also the means of transport and travel. Each epoch with it's changed condition, throws new challenges to the people. These external challenges can be met only by mobilizing the inner spiritual resources of the people. It is through ideas and ideals that the inner energies of man get mobilized. Certain charismatic individuals who become masters of new religions or new religious movements develop the new ideals necessary for each epoch.