In Hughes v. State, 878 S.W.2d 142, 148 (Tex. Crim. App. 1992), this Court stated that a prospective juror who cannot distinguish between probable and possible is properly challengeable for cause and that the trial court abused its discretion in denying such a challenge. Too, the legislature was very specific when it promulgated the procedures for assessing the death penalty, and this Court is bound by those procedures. The legislature required "probability," and so must this Court.