1 Corinthians 2 v 9-10


1 Corinthians 2:9-10 
(9)  But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him. 
(10)  But God hath revealed them unto us by his Spirit: for the Spirit searcheth all things, yea, the deep things of God. 


2:9-10. The blessings of salvation were prepared by the Father, carried out by the Son, and applied by the Spirit (Eph. 1:3-14) to all believers who as a result love God (1 John 4:19). The only way the Corinthians could know this was by the Spirit, who knows and reveals these deep things of God about salvation. 

Excerpt from: 
Walvoord, J. F., Zuck, R. B., & Dallas Theological Seminary. (1983-c1985). 
The Bible knowledge commentary : An Exposition of the Scriptures. 
Wheaton, IL: Victor Books.