Getting rid of sickness is for the purpose of seeing abilities and intentions. As long as you are not rid of sickness, you will be distracted by it and fail to see. When you fail to see, you lose. Sickness means sickness of mind. Sickness of mind is when the mind tarries here and there. One should make sure not to let the mind linger on the point where one has struck a blow of the sword. This is a matter of relinquishing the mind without abandoning it.
