On what subject(s) are you an authority?

To be an authority on a subject is a tough task. I am a doctor and work as General Practitioner. I am good at lots of things but may be not an authority.
Knowledge, resources and capacity for learning is infinite. How can anyone know everything about a subject and more so retain it.
As long as I am sincere and keep working hard for my goals, I will be happy.
Stay happy, Sinha. You help many people
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Thank you so much
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I would like to say that I am an authority on me after so many years. This might be safe to say as an English teacher, the language and rules sometimes change it seems but then again, so do I.
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Oh yes I agree teachers are an authority. You all help the next generation and the world keeps going. 🙏🏼
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