Final answer:
The hardest worker is someone who finds fulfillment through their hard work.
Step-by-step explanation:
The quote that backs up the idea that hard work is its own reward is: "Which ever through her gentle actions speaks, That life is given to labour and to love." - Louisa Susanna Cheves McCord, "Woman's Progress," 1853. This quote implies that by working hard, one can find fulfillment in life and feel a sense of accomplishment.