'If a manager tries to control everything, he may end up in controlling nothing'

‘If a manager tries to control everything, he may end up in controlling nothing’. Explain.
or
’An effort to control everything may end up in controlling nothing. Explain.

If a manager tries to control everything, he may end up by controlling nothing. To make control effective and economical, it must focus attention on factors critical to performance, e.g. in a large organisation, keeping a close check on each and every-activity will be very time consuming and expensive. Therefore, managers should pay serious attention to only such cases, which are critical to success, i.e. KRAs.