why does louka tell nicola that he has the 'soul of a servant'?

A little less than four months have passed since the incident with the chocolate cream soldier. Louka and Nicola stand in the kitchen with the used breakfast dishes arguing about the proper attitude towards their employers. Louka sneeringly accuses Nicola of having “the soul of a servant” and hints that she could reveal many of the Petkoffs’ secrets if they were to quarrel with her (23). Nicola remains calm and explains that he knows many more secrets than Louka, but that using them against the family would only backfire.