There are two kinds of processes of acquiring knowledge. One process is deductive, and the other process is inductive. Those who are student of logic, you know that there are two processes: deductive knowledge and inductive knowledge. Deductive knowledge is considered to be more perfect. And what is that? Just like "Man is mortal." This is a truth, accepted. How man is mortal, nobody's going to enter into discussion. It is accepted that man is mortal. Now, Mr. Johnson is a man. So he is mortal. This is the deductive conclusion. Because man is mortal and Johnson is a man, therefore he's mortal. This is the process of deductive knowledge. Now, how this man is mortal, this truth established? The other party, those who are inductive, follower of inductive process, they want to see actually by experiment and observation how man is mortal. They want to study, "This man dies. That man dies. That man dies. That man dies." Therefore they make a general conclusion, "Well, all men are mortal."
Now, in the inductive process you have got some defects. What is that? Now, your experience is limited. Suppose if you have not seen a man who is not mortal, who is not mortal. There may be. Because you are going on with your personal experience, but your personal experience is always imperfect.