Contemporary English Version (CEV)
John didn't seem to know exactly who the Son of God was until the time came. Considering that all of John's life had served to prepare the way for Jesus, it's striking that he didn't know his cousin was the Son of God until then. He had an incomplete picture of exactly who his cousin was until God revealed the truth to him.
We often treat people like we know the whole picture, when in reality we don't fully understand them. We make assumptions that we know enough to form a complete picture, and so we paint them into a box and aren't ready to change our minds.
What Christ calls us to do is be humble in our relationships, always ready to serve the other, remembering that they are made in the image of God. Depend on the Spirit to guide you, rather than assuming you know the way. I don't understand the entirety of my role here on earth, and so we can depend on the Spirit to lead us, day by day, and guide us in our relationship with God and our relationship with others.