This video has a lesson from nature. Some parts are a little hard to watch, but the message is clear.

And now some quotes of determination to live by:
Never give in! Never give in! Never, never, never, never – in nothing great or small, large or petty. Never give in except to convictions of honor and good sense.
Winston Churchill

Never consider the possibility of failure; as long as you persist, you will be successful.
Brian Tracey

Nobody trips over mountains. It is the small pebble that causes you to stumble. Pass all the pebbles in your path and you will find that you have crossed the mountain.
Author Unknown

Nothing can withstand the power of the human will if it is willing to stake its very existence to the extent of its purpose.
Benjamin Disraeli

Nothing great will ever be achieved without great men, and men are great only if they are determined to be so.
Charles De Gaulle