Hold a candle. To hold a candle to one, is to wait on him. Hence, 'yon are not fit to hold a candle to him,' is equivalent to, you are not fit to be even his servant; or not to be compared to him.
I have heard in my time a good many men speak French, but I never see the man yet who could hold a candle to the Prince de Joinville. It was like lightnin', jist one long-endurin' streak. It was beautiful, but I couldn't understand it, it was so everlastin' fast.--Sam Slick in England, ch. 22.
Talking about the popularity and glory of his administration--"Why," says the General, "nothing can hold a candle to it."--Maj. Downing's Letters, p. 233.