Answer:
Gandhi repeats the expression "Justice based on" to reinforce the importance of justice in human activities.
Step-by-step explanation:
By repeating the expression "Justice based on" Gandhi wants to reinforce the idea that justice must be present in all our activities, since it is the most influential factor in human progress and success, but it is important that justice is based on positive things for this progress to really occur and for justice to be, in fact, fair. In this case, a justice based on violence is not a correct and admirable justice and for that reason, it should not be encouraged.