To realize and acknowledge that one's past views or actions were incorrect, and current ones are right; to regret past errors and embrace present correctness.
经过多年的学习和反思，他逐渐认识到自己过去的某些观念今是昨非，从而不断完善自我。
After years of study and reflection, he gradually realized that some of his past views were incorrect, thus continuously improving himself.
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