In the beginning of A Raisin in the Sun, Walter is very bitter. He wants to pursue his dream by starting an alcohol company (without a liquor license and becoming rich.
He was also very hostile towards Beneatha because she was close to achieving her dream of being a doctor.
However, Walter decides to not accept the money, sho he can keep the pride of his family and set a good example for his son. The growth of Walter illustrates the theme that success comes from doing what is morally right as opposed to how much money you have.
However, he became wonderfully cheerful when Mama presented him with a portion of the insurance money.
Then, he dream is crushed when his "business partner" takes the money he gives to him without helping him start the business.
Transformed into his old self, Walter wants to take the money that Mr. Liner offered his family to keep them from moving a Caucasian neighborhood.