If you ever find yourself facing a once in a lifetime opportunity that will help you fulfill your destiny here are a few lessons that you can learn from David when he faced his once in a lifetime opportunity to fight Goliath:
When King Saul told David, "You are not able to fight against this Philistine because you are a youth and he is a man of war from his youth." (1 Samuel 17:33)
David endorsed himself and replied, "I used to take care of my father's sheep and when a lion or a bear stole a lamb from the flock, I went after it, struck it and delivered the lamb from its mouth. (1 Samuel 17:34-35)
Therefore endorse yourself and stop waiting for people to endorse you.
Encourage yourself.When David's big brother heard him inquiring about Goliath, instead of encouraging him he tried to discourage him by publicly telling him, "I know your pride and rude, disrespectful behavior (insolence)" (1 Samuel 17:28) But David did not let those word deter him. He simply turned from him. (1 Samuel 17:30)
Therefore stop waiting for people to encourage you before you take action. Encourage yourself in the Lord and turn away from those who are discouraging you.
Believe in your abilities.
David believed in his abilities and he confidently told King Saul, If it attacked me, I caught it by its beard, struck it and killed it. I have killed a lion and a bear and this Philistine will be like one of them. (1 Samuel 17:36)
Therefore stop waiting for people to believe in your abilities before you make the move. Believe in your abilities and make the move.
When King Saul clothed David with his armor, bronze helmet and coat of mail, David took them off and told the king, "I cannot walk with these since I have not tested them." (1 Samuel 17:38-39)
Therefore stop trusting what others know more that you trust what you know.
Believe in God's ability to help you.
David believed in God's ability to help him for he confidently stated to King Saul, The Lord who delivered me from the paw of the lion and the paw of the bear, He will deliver me from the hand of this Philistine." (1 Samuel 17:37)
Therefore stop doubting God's ability to help you. Trust Him and make most of your once in a lifetime opportunity.