I think I finally understand what this means.. The ability to face up to the fear of losing something or someone, and let go of that fear.
Our resistance of a possible future event that we deem as unpleasant creates fear. In order to be One, we must accept and be willing to lose that someone. For once we become willing, we let go of that fear, and make peace with what our life is. Our thoughts translate that into action or non-action, and we become at One with ourselves ~ going with the Tao(flow). And with the natural flow, we become at ease. Following the nature of the universe, what will be, shall be.
This, of course, does not imply a blind adherence to fate itself.. while we have accepted being able to lose that something or someone, we attempt to create the atmosphere of success. But yet because we have lost the fear and are willing, what we have chosen to do is chosen with clarity and peace of mind. And as we go with the Tao, we are able to accept what comes next, because, what is yours, will be yours.
Just some thoughts as my bf's friend has just lost her love. Take care and I used to believe and still strongly believe that THE.BEST.IS.YET.TO.COME. Smile, gal.. you deserve a better guy.