If opportunity does't knock, build a door - milton berle. what does this quote mean?

I believe Milton Berle means if chances don't just come to you, make them come by working hard.

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“If opportunity doesn't knock, build a door” - Milton Berle  

This only means you shouldn't wait for an opportunity to come. If fate is not feeding the exact destiny you want to happen in your life, better do something that can lead you there. Opportunity is created. You don't have to wait for it. Nothing will ever happen unless you start doing something big. Never allow luck to strike you. You have to make it. Use the skills and knowledge that you have to make a difference.

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