The quality of Taiji ultimately depends little upon technicalities and more on the size and content of the heart that performs it. A Taiji heart is always endeavouring to be big enough to contain the active body that contains it, and should always be abrim with compassion. For this the dantien underpinning it must be cold and ruthless and strong. Without such support it doesn't matter how magnanimous and full of love the heart is, it will always falter and wither when the going gets tough, which it inevitability will, especially as death approaches.