Sri Chinmoy: We can increase the mind’s sincerity by compelling the mind to remain inside the heart. This is the easiest and most effective way. The earth-bound mind is not sincere and cannot be sincere. But when the mind becomes calm, quiet and vacant, it automatically becomes sincere. If a great boxer does something wrong, undivine, he will not be afraid of a weakling who criticises him. If the other person is of his standard, however, the boxer may deny his deed. The greatest boxer may do many things that we may not approve of, but his life is an open book. He does not care what we think. So the superior who has the strength, the power, even if he does something wrong, does not have to tell a lie. By telling lies he is not gaining anything. But an ordinary person will try to hide.
Here we are speaking of mundane reality. On another level, if the heart identifies itself with infinite Reality, the infinite Power, and if the mind goes and takes shelter inside the heart, then the mind automatically becomes sincere. For the mind does not have to tell a lie and justify itself. It does not have to be afraid of anything. So the mind must take shelter inside the heart.