And he said to them, “The harvest is plentiful, but the laborers are few. Therefore pray earnestly to the Lord of the harvest to send out laborers into his harvest."
Luke 10:2

The souls of men have a great need. How does this affect you? Are your emotions stirred? Do you hear their cries for help?
Can you see the need? Are you looking? What are you seeing? Are you seeing the harvest? Are you seeing the greatness of the harvest?
I have two pear trees at my house. Each year I look forward to tasting their ripe fruit. You would be amazed how many pears two trees can produce. My wife makes delicious pear pies and cooks many of them down into pear butter. Oh, they are so good. But every year, there are many fruit that fall before being picked, and in their ripeness they spoil and rot where they fall.
I would not tread on the doctrines of election, but I do hope to stir you up, myself included, to look upon the harvest and desire that fruit and treasure it, not willing that any should fall and rot. "For where your treasure is, there your heart will be also." (Matthew 6:21) Treasure the sacrifice of Christ. Treasure His glory.
See how great the harvest is. If you labor it will not be in vain. You will find abundant opportunities. Do you sense the expectancy and hope?
Is it important to you that the laborers are few? At least, our laborers are few. As I've shown recently, the laborers of the enemy are many.
The laborers of atheism are not few.
The laborers of evolution are not few.
The laborers of amorality are not few.
The laborers of human autonomy are not few.
The laborers of globalism are not few.
They indoctrinate children in the public schools and universities. They broadcast their messages each night on the news and in their entertainments. They broadcast their philosophy in the songs and talk shows on the radio. They write their own laws from the benches of the courts. They proclaim their own morality through their organizations and charities. The laborers of humanism are not few and you even pay their salaries with your taxes and charitable contributions.
The harvest is plentiful and the Lord's laborers are few. Are you pleading?
Why are we asked to pray to the Lord to send laborers? I believe John Piper gave a great answer to this question in his sermon, "Prayer at Harvest Time: Now!" from January 3, 1982:

God has willed that his miraculous work of harvesting be preceded by prayer. He loves to bless the world. But even more, he loves to bless the world in answer to prayer. It is God's way before he does a great work to pour a Spirit of supplication upon his people so that they plead for the work... If in his sovereign kindness he pours out upon you the Spirit of compassion and supplication and there is a great movement of prayer, then I would begin to count the days till harvest begins.

Do you wonder at your purpose? Apparently 25 million people want to know their purpose. Are you waiting for a sign? A herald?

All authority in heaven and on earth has been given to me. Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all that I have commanded you. And behold, I am with you always, to the end of the age.
Matthew 28:18-20

You don't need to find a purpose. You have a commission. (This really is the best word for it. Consider the definition from the American Heritage Dictionary: "The act of granting certain powers or the authority to carry out a particular task or duty.")
You need a response.

And I heard the voice of the Lord saying, “Whom shall I send, and who will go for us?” Then I said, “Here am I! Send me.”
Isaiah 6:8

May the Lamb that was slain receive the reward of his suffering.