There are two kinds of suffering—conscious and unconscious. Only a fool suffers unconsciously.
In life there are two rivers, two directions. In the first, the law is for the river itself, not for the drops of water. We are drops. At one moment a drop is at the surface, at another moment at the bottom. Suffering depends on its position. In the first river, suffering is completely useless because it is accidental and unconscious.
Parallel with this river is another river. In this other river there is a different kind of suffering. The drop in the first river has the possibility of passing into the second. Today the drop suffers because yesterday it did not suffer enough. Here the law of retribution operates. The drop can also suffer in advance. Sooner or later everything is paid for. For the Cosmos there is no time. Suffering can be voluntary and only voluntary suffering has value. One may suffer simply because one feels unhappy. Or one may suffer for yesterday and to prepare for tomorrow.
I repeat, only voluntary suffering has value.