well to a certain degree you can
example: you are up for your dream job...you are by far the best candidate and hence get the job...you are happy.
person who didn't get the job is unhappy...you INDIRECTLY impeaded upon his happiness
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The secret of health for both mind and body is not to mourn for the past, not to worry about the future, or not to anticipate troubles, but to live in the present moment wisely and earnestly.
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