The fourth station is that of the Righteous (Salihin) and this too at its highest level is a sign and a miracle. Perfect salah (i.e. being sound or pious) is when there are no traces of fasad (which in Arabic means to be corrupt or devoid of virtue). A sound body (that enjoys a state of salah) is pure from all kinds of corruption and infection. Only when a person is free from infection and full of elements that are conducive to health and well-being, can they be deemed a salih (in the physical sense). Further, until a person is good and sound, the elements that relate to them cannot be good and desirable either, to such an extent that even sweetness tastes bitter to an individual who is unwell. In the same manner, until a person becomes a salih and does not refrain from all forms of evil and is not purged of the corruption within, worship feels bitter. Such a one will attend the Prayer, but feels no pleasure and enjoyment; he pecks his head and finishes his Prayer with an ill-omened face and then leaves. However, pleasure is derived in worship when a person is cleansed of the impurity from within. It is then that one develops a desire, fervour and joy and it is from here that the point of man’s reformation begins.”
(Malfuzat [English], Vol. 2, pp. 92-93)