If you want to have any hope of inspiring somebody then you must be prepared to give as much of yourself as you possibly can to them without ever expecting anything in return - even if they do not respond to your preaching. By preaching without attachment to results we can remain inspired to preach in any condition whether somebody is receptive or not. This does not mean we need to preach forcefully. Rather we need to show that we care. That effort, in of itself, although possibly not bearing any immediate fruit, still can leave a lasting impression, which will bear a fruit in future.