Musar על בבא בתרא 219:4

However, our sages of blessed memory, who always instructed us and guided us on the paths of truth said: "love work and hate Rabanut" (Avot 1:10), and further "flay carcasses in the marketplace and earn wages and do not say, 'I am an important man, I am a Kohen, [and it is beneath my dignity]'." (Pesachim 113a), and further "one should always hire himself out to work which is strange to him rather than be dependent [on the help] of others" (Bava Basra 110a).