When King said "physical strength with soul strength" he meant people not to use physical strength to achieve their goals, but to use soul strength to stay motivated.
This is connected with the idea that "undeserved suffering is redeeming", as it shows that with the strength of the soul, people can withstand the injustices that they alleviate until they manage to resolve them.
We can arrive at this answer because:
However, he stated that this fight should be done with the strength of the soul, that is, with the strength of will and resilience, but that physical strength and violence should not be used.
More information about King at the link:
https://brainly.com/question/3832772
