Why do some people have to work so hard at life while others just succeed without trying?

Preparation, opportunity, and timing. If you're missing even one of these, hard work will be a common thing in your life.

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Few people can succeed without trying. And working hard brings rewards in life. Coasting doesn't.

Some have greater ability.

Cuz life's not fair

Because life is NOT about fairness but luck.

Some are lucky and some are not.

There's nothing personal about it unless you make it personal.