What motivates the character I am playing

I am playing Oedipus in the scene where he is trying to figure out who killed Laius. His motivation is to uncover the truth and to come to a conclusion of who killed him. Evidence that supports this is when he states at the very end of his speech that "I'll bring it all to light myself" and "For my own sake I'll rid us of this corruption" he wants what is best for his people and he want to see an end to the corruption.