By heaven, I had rather coin my heart
And drop my blood for drachmas than to wring
From the hard hands of peasants their vile trash
By any indirection. (4.3.75-79)
He explains to Cassius that there is no way that he will ever take money from other people for no reason. These show his nobility because they demonstrate how once he commits to something he won’t go back on it and will always continue to uphold his high standards for his personal morals and never do anything that goes against them which would go with the definition of a person with fine personal qualities. In a comparison to the other characters, there is no one else who upholds their morals like Brutus and stays true to his decisions and reasoning. For example, Antony goes against the promise he made to Brutus and Cassius to say good things about the conspirators and instead secretly turns public opinion against them. Also, Cassius goes against his personal morals when he becomes greedy which is part of the reason why they killed