In the Gospel of Matthew, Jesus instructs His Disciples that although many will be Saved, there will be very few who work to spread the Gospel. Though it was nearly 2,000 years ago, Jesus encouraged His Disciples to immediately begin sowing the Word. Though Salvation is not and cannot be accomplished by works, there are immediate and eternal rewards for winning people to Christ.
Christians can make an eternal investment in the Kingdom of God.
Behold, I say to you, lift up your eyes and look on the fields, that they are white for harvest. In the Gospel according to Mark, Jesus presents the teaching of seed sown into four different kinds of soil. 7 Other seed fell among the thorns, and the thorns came up and choked it, and it yielded no crop. 8 Other seeds fell into the good soil, and as they grew up and increased, they yielded a crop and produced thirty, sixty, and a hundredfold. Many followers of Jesus, including the Twelve Disciples, asked Him to explain the mystery presented in the parables.