Lu Cheng asked: 'The fullness of equilibrium and harmony in joy, anger, sorrow, pleasure is surely beyond ordinary people. Yet take some small matter that should stir feeling: if one has felt nothing beforehand and the response stays in measure, is that not equilibrium and harmony too?'
The Master said: 'For the moment and the single affair it may be so called, but not yet the great root and the reached Way. Human nature is all good; equilibrium and harmony belong to everyone originally — how could they be absent? But the ordinary mind is dimmed and veiled; its substance shows forth from time to time, flaring and failing, not its whole substance and great functioning. Equilibrium everywhere, then it is the great root; harmony everywhere, then it is the reached Way. Only the utterly sincere under Heaven can establish the great root.'
'I do not yet grasp the meaning of equilibrium.'
'It must be recognized out of your own mind; words cannot convey it. Equilibrium is heavenly principle.'
'What is heavenly principle?'
'Remove human desire, and you know heavenly principle.'
'Why is heavenly principle called equilibrium?'
'Because it leans nowhere.'
'What is that like?'
'Like a bright mirror, wholly luminous, not a speck of dust clinging.'
'Leaning means clinging — to beauty, gain, fame. But before arousal, none of these has yet attached itself; how do we know the mind leans?'
'Though not yet attached, the daily desires for beauty, gain and fame were never absent; never absent, they must be called present; and if present, the mind cannot be said not to lean. Like a man with malaria: though the fit is quiet, the root was never removed — he cannot be called well. Only when every private desire has been swept away without a thread remaining, the mind's whole substance vast and pure in heavenly principle, can it be called the equilibrium before joy, anger, sorrow and pleasure — the great root of all under Heaven.'