Комментарий о цитате к Берешит 31:38

הכי אחי אתה ועבדתני חנם?, ”do you have to serve me without recompense just because you are my family?” Nachmanides points out that the Torah had not even mentioned that Yaakov “served” Lavan, It is possible, that as soon as Yaakov had met Rachel, he had taken over her former duties of tending Lavan’s flocks. He did so because he had fallen in love with her. It is also possible that Lavan had immediately spoken to him with deceitful intent, saying that seeing he was family, he would provide for him as a family member. After a month had passed, he suggested to Yaakov that surely as a moral individual he would not expect Lavan to continue doing this without Yaakov compensating him. Since he did not want him to have to be in the service of people unrelated to him by blood, and he also could not afford to feed him for an indefinite period without Yaakov compensating him, he suggested that Yaakov work for him and that he tell him what he expected in the way of wages. Yaakov realized what was on his mind, and suggested that he would work for Lavan for 7 years in order to receive Rachel’s hand in marriage. The עבודה that the Torah refers to here, is simply the tending of Lavan’s sheep. Lest we think that this was an easy vocation, Yaakov in Genesis 31,38-42 describes in detail what extreme discomfort was involved when one took one’s responsibilities in this regard seriously, as he did. Some commentators believe that what Lavan had in mind was to appoint Yaakov as what is known in halachah as שומר שכר, a paid guard, someone who is responsible for the items entrusted to him, being liable for theft, loss from a variety of causes, as opposed to an unpaid guard who is liable to make restitution for any loss only when negligence or worse can be proved against him.

Implying toughness. See above in Parshas Vayeitzei on the verse (Bereishis 31:38): “[And I did not eat any] rams of your flocks...”