Q. How does it come that saints bleed out of the wounds where Jesus was crucified? A. That was the result of concentration. What does concentration mean, and what is the use of concentration? It seems to everybody out of ordinary, for the reason that everybody does not know what real concentration means. Concentration is to turn oneself into the object of concentration, which is not within the power of everyone. A person who has once mastered concentration he has not very far to go. Then his next step will be the realization of the purpose for which he concentrates.