Paul was a humble man. He understood that he was participating in something that was beyond him. And yet, this fact did not hinder him from knowing certain things about God. It did not keep him from speaking boldly about the events of the gospel and their implications. It did not keep him from offering blessings of certainty and wisdom to his fellow believers. Paul views this certainty as a fact of his relationship with Christ.
In this relationship, we can have deep roots in God’s love to keep us strong. We can have knowledge that we couldn’t otherwise experience as finite beings. This isn’t a gained knowledge but a given one. And what is given is not just a mental ascent but a lived experience. It is not exhaustive, but it is a true knowledge of the depth of God’s character. This would be enough of a blessing, but Paul brings it a step further by promising that such an acceptance of his blessings allows us to become complete. In him, we can be absolutely who he intends us to be. In him, we can know what we couldn’t know otherwise. In God’s wisdom, we can live securely in the mystery of how an infinite being could connect with a finite being. The fact of this relationship will give us certainty in all other relationships. It will teach us every dimension of every relationship.