Warren Buffett's metaphor of a "lifetime decision card with just twenty punches" emphasizes the importance of making thoughtful, deliberate investment decisions. He suggests that investors should approach each decision as if they have limited opportunities to invest wisely—only twenty in a lifetime. This encourages careful consideration and due diligence instead of impulsive or frequent trading. By treating each investment as one of a limited number of chances, investors are more likely to focus on high-quality opportunities that offer the best long-term potential rather than chasing short-term gains.