Jesus mentions his unity with the Father rather offhandedly and so it's easy to miss how little we believe in it. We feel comfortable with Jesus, but we figure the Father is a distant deity who probably doesn't share the Son's friendly feeling. The Son is close, the Father is far off. The Son is intimate, the Father is aloof. The Son is safe, the Father is . . . questionable. But here, as in many other passages, Jesus makes clear he and the Father are one. Whoever receives him is receiving the Father. Whoever loves him loves the Father. Whoever knows him knows the Father. He is the revelation of the Father. His love, his humility, his compassion, his open arms are all the Father's too.
In other words, everything you love about Jesus is true about the Father too. We act as if Jesus is sweet nectar that goes down smooth while the Father is an oversized pill that we have to choke down. But if you receive Jesus, you have also received the Father. That wasn't so hard, was it?
"He who receives you receives me and . . . receives him who sent me." It's weird to think that we form the earthly end-link in this trinitarian chain of relationships that leads all the way up into heaven. Evidently, we are so united to the Father and the Son that whoever receives our testimony receives them too. And when you think about it, even when we're not actually ministering the word to people, everyone we have a relationship with is only one step removed from knowing the first and second Persons of the Godhead. That ought to impact the way we live on a daily basis. The New Testament epistles use the word "dignity" when describing how mature followers of Christ ought to conduct themselves. That pretty much sums it up.