God's Eternal Purpose?

The local Church of Christ preacher had the following outline in his weekly bulletin:

God had [and continues to have] an eternal purpose (Ephesians 3:11):

      1. His very nature is purposeful (Isaiah 46:8-11; Jeremiah 4:28; 
          Ephesians  1:11)          
      2. His eternal purpose is to give eternal life (John 10:10,27,28; 
          Titus 1:1,2).

      3. This is not mere eternal existence, but eternal existence with 
          Him (Matthew 25:31-46).

 In The Beginning there was unlimited power  
      1. Defining power: “capacity to produce a desired result".
       2. Various kinds of power; physical, mental, political, legal, moral. 
          Type of power used depends on result desired.

      3. The power of God: all the power necessary to accomplish His 
          eternal purpose.

So, let me see if I've got this right. God (Yahweh) is a purposeful God. And his eternal purpose (def. The reason for which something is done or created or for which something exists; something set up as an object or end to be attained), is to give eternal life to man.  And he had all the power necessary to accomplish this eternal purpose--this desired result--in fact this desired result was the purpose of man's creation.

Then why is it that only a FEW (Mt 7:13-14) will attain what this God had all the power necessary to accomplish?

Kenneth W Hawthorne