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:
- King was an activist and the greatest leader in the struggle for civil rights.
- He encouraged a black offer to fight for their rights and not conform to the injustices they suffer.
- He believed that these injustices would pay off in the future, but it would be necessary for people to fight for them to cease to exist.
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.
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