Sri Aurobindo
Letters of Sri Aurobindo
Volume IV - Part 3
When these things [base feelings such as jealousy] are rejected 
and disappear for a time, some part of them may go out into the environmental consciousness and from there they can return in a wave from the general Nature. If one is conscious, one can even feel them coming in. The rejection of such returns is an important part of the purification and it is not complete till this power of returning is no longer there. But also it may be that some part is not so much rejected as suppressed by mental control, then it sinks into the subconscient and when the subconscient is active (as in dream or in a passive state of the mind) or else when the subconscient itself is brought up for purification, then it may rise up even with much violence. There especially the sense that one has to begin all again and nothing has been done may come upon the sadhak. But it is not so really. One has to be firm and not get upset but this time detach firmly and completely so as to uproot completely from the nature.