The 'four bases of supernatural power.' These are: (1) 'desire power,' (yushenzu 欲神足), the desire to gain excellent meditation; (2) 'effort power' (qinshenzu 勤神足) the effort to gain excellent meditation; (3) 'concentration power' (xinshenzu 心神足) the gaining of control over thoughts and (4) 'wisdom power' (guanshenzu 观神足), the good function of analytical meditation.