Answer:
Check below for the answer and explanation.
Step-by-step explanation:
This means that both stubborn optimism and determined action are complementary. None can produce great results without the other. If you are highly optimistic about a cause, you should also also dispense an effort towards the achievement of that cause, without this determined effort such a cause will not be achieved. Similarly, a determined action without high hopes and optimism towards the achievement of the goal will also not yield a great result. This means that none is self-sustaining without the other.
Therefore, we can change any situation and even the entire world if we are highly optimistic and put in a determined action into that cause.