The best mind-altering drug is the truth.

In a characteristically wry, countercultural turn, the line treats “truth” as a substance that can intoxicate, disrupt, and transform consciousness more powerfully than chemical drugs. It suggests that honest perception—about oneself, society, or power—can produce disorientation, euphoria, or discomfort, because it forces a reordering of assumptions. The quip also carries an ethical edge: rather than escaping reality through artificial means, one can be “altered” by confronting reality directly. As a comedic aphorism, it compresses a serious claim into a punchy paradox, aligning Tomlin’s humor with social critique and the idea that clarity can be radical.