The Peter Sellers's character that is continuously quoted more than any other is Clare Quilty. This personality was played by Sellers specifically in Stanley Kubrick’s 1962 film Lolita. This character is relatively minor in Nabokov’s brilliant novel, but takes on a much more significant role in the film. Pointedly, in fact, Quilty in many ways becomes one of the centers of the film which is evidenced by Kubrick’s daring creative choice to reorganize the narrative sequence of the novel by making “Dr. Humberts” murder of Quilty the first scene of the film.

Quilty is a protean character that is dogging Humbert throughout the film in the form of several imagined characters that very much foreshadow Sellers more celebrated performances in Dr. Strangelove. Quilty acts as a deranged conscience for the audience, constantly finding the opportunity to remind Humbert of his moral crimes while at the same time waiting for the moment to engage in it as well.

There are several key scenes in Lolita that highlight some of the amazing dialogue and acting that continually bring us back to the idea that real genius is contained in the full context of the film, titled Lolita.

More Info: en.wikipedia.org