Pretty much describes us. Even with the gifts we are given, John 15:5 is absolutely still true.
Being chosen by God does not in itself equip. There has to be experience and time involved in preparation. David knew this from experience. He was anointed king in 1 Samuel 16. David did not take the throne of Israel until 2 Samuel 5. During much of that time he was fighting for his life.
Knowing what he knows, David petitions the Lord for the people and for his son Solomon. That the people, of which Solomon is a part, will have their heart directed to Him. For Solomon specifically, David prays for a heart perfect in obedience.
There are examples in for us in the New Testament as well. In Acts 18:24 – 28, we read of Apollos, gifted, accurately teaching what he knew. He just needed more guidance. Pricilla and Aquila, pulled him aside and gave him direction.
Paul wrote 1 Timothy, 2 Timothy, and Titus to encourage and strengthen the hand of two of the best me he trained.
We are the living stones, we have been gifted, we have been assigned to build His Church, but we cannot do it alone. We cannot, do it without the input of those who have and are going before us.
There is much more that can be said, but rather than writing it here you may want to take a look at the “one another” passages in the New Testament.