Be open to learning new lessons even if they contradict the lessons you learned yesterday.

The quote urges intellectual humility and adaptability: treat beliefs as provisional and remain willing to revise them when new evidence or experience arrives. By explicitly allowing contradiction with “yesterday’s” lessons, it frames growth as iterative rather than linear—progress can require unlearning, not just adding knowledge. It also implies that consistency is less important than honesty and responsiveness to reality, a stance aligned with reflective practice in education, therapy, and leadership. The underlying ethic is openness: staying teachable prevents dogmatism and makes personal development possible even when it is uncomfortable or destabilizing.