There is this world around man, which consists of dead matter as well as life. The dead matter has no feeling, but it is something that exists, it is a truth that is present in the apparent world – it is known as Sat.
Then there is life. This has consciousness. It is known as Chit. However, man is constantly in search of something more–and that is a never-ending happiness. Both, atheists and believers, thirst after the same thing. This is known as Bliss or Anand.
Dead matter cannot give everlasting happiness, nor can life and consciousness. Thus the world around man does not have the everlasting happiness or Bliss, which he seeks to make his life meaningful.
Ultimately man discovers that everlasting happiness or Bliss or Anand lies only in God. He also discovers then that God is Sat-Chit-Anand, a combination of all three.
The world around him was Maayaa, an illusion that presented a face of Sat and Chit but which contained no happiness. It was only when the light of Knowledge dawned upon man that the world changed into Sat-Chit-Anand, which was Brahm Himself.
When the light of knowledge dawns upon man, the world does not vanish from his sight and senses–it remains there in its outer shape and form, but man begins to experience an untold happiness in it, which comes only from God. Man sees the world changing into the beautiful face of Brahm. This is again like the rope and the snake. When full light is thrown on the scene, the snake does not disappear from sight, instead it becomes transformed into a rope.