1 Corinthians 4:1
So then, men ought to regard us as servants of Christ and as those entrusted with the secret things of God.
In chapter 3, Paul talked about our position in Christ and the fact that we, along with Him, own everything. Now, he tells us that, because we own all things, we should be known as good servants (stewards) of God. The word servants here means ministers or stewards and each of them describe a person that has been put in a position to give out the things of the master. Paul goes on to say that we are stewards over not only the physical things but also of the great spiritual truths of God. The "secret things" refers to the mysteries of God which are things that had not been revealed before and cannot be understood by the flesh but only through the Spirit.