Meditation needs you in your totality. Nothing less will do. If you withhold something, and just do it halfheartedly, it is better not to do it, because the whole effort is useless. You will be simply tired and nothing will happen. So why unnecessarily tire yourself? If you are half in it you will be tired. And if someone feels tired — remember this, and find out — he will be half in it. If you are totally in it, you will be refreshed, not tired. This is the difference. If you are TOTALLY in it — nothing has been retained, nothing has been withheld; you were in it totally, the doer was not standing outside; the doer has become the doing — then you will come out of it fresh, fresh like the dew in the morning, fresh like a rose just opening; fresh, full of energy, light, dancing… blessed. And not only blessed, in such a state of mind that you can bless others.