The world appears to be true only because of the mind or memory.
After all we get the various experiences in the world by virtue of mind. If mind were not there, we won't get any experiences, such as pain, pleasure, joy, sorrow etc. The mind sits on top of our conciousness & makes us feel that the imaginary is real. Just as in a cinema theatre, on the screen, we can see moving pictures, which appear to us as real, but they are unreal. What exists there is only the screen.
Hence to get rid of world or Samsara, we need to get rid of the mind or arrest it's movement i.e. moving from one thought to other. This can be done by concentrating on one single object (Sai baba) & continuing this practice over a period of time. Sai baba has said "When the mind is concentrated the Goal will be attained."......