When we try too hard all our energy is wrapped up in the result. The future outcome may or may not happen, as the future never occurs, it will always be now when or if we get there.
So the mind is constantly willing an outcome that only exists in our mind and therefore the energy does not go to the actual doing of the work in the now.
When we are actually doing work towards that future, with the focus only on the result, we are unable to concentrate on our work in a good way as we are full of anxiety about the future outcome that we are so desperate to achieve.
The outcome is not important, it is the actual focus on doing our very best now and nothing else. What we do now always creates the future, but we can’t predict the outcome today. We can choose to accept that by enjoying the process of work now and thus relieve the anxiety and pressure the expected result always brings.