Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things.
Philippians 4:8
Optimists look toward the future and see wonderful possibilities.
Because of this outlook, they are perfectly situated to determine what needs to happen now to arrive at that future state.
On the other hand, a person who is pessimistic cannot see a better future. And they cannot see any point or reason to try anything new right now – because they have no vision where those actions would lead.
In reality, any leader who gets anything done has some measure of optimism.