Problems are servants. They help you grow and lead to better things, both within your organization and in your life. To resist them is to avoid growth and progress. Embrace and get the best from the challenges in front of you. And understand that the only people with no problems are dead.
An unhappy customer yelling at you might seem like a problem. But to a person thinking like a leader, that scenario is also an opportunity to improve the organization's processes to ensure that doesn't happen again. So the problem has actually helped to improve the company.
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