"Every individual is required to serve G-d according to his nature and spiritual level. A person who can pierce pearls or polish gems, yet occupies himself with baking bread, is considered to have sinned, even though this too is a much needed task. The parallels to this in our Divine service are obvious." Igros Kodesh of the 6th Lubavitcher Rebbe, the Rebbe Rayatz, letter #1022, Heb. Vol. 4, p. 340.
"~ A Story with an Echo ~
The Alter Rebbe would tell the following story." One Friday afternoon, a wagon driver drove his wealthy and pampered employer to the mikveh, and then led his horses to the stable where they would be housed over Shabbos. As he was leaving, he saw a squad of soldiers dragging a Jewish family away in chains. He sprang up and with a few powerful blows felled several of the soldiers. Before a major struggle erupted, their commanding officer approached him calmly."