The Only Clean Hands and Pure Heart the World Has Ever Known

 Who shall ascend the hill of the Lord? And who shall stand in his holy place?  He who has clean hands and a pure heart,who does not lift up his soul to what is false and does not swear deceitfully.  He will receive blessing
from the Lord and righteousness from the God of his salvation. Such is the generation of  those who seek him,
who seek the face of the God of Jacob.  Lift up your heads, O gates! And be lifted up, O ancient doors, that the
King of glory may come in. Who is this King of glory? The Lord, strong and mighty, the Lord, mighty in battle
Lift up your heads, O gates! And lift them up, O ancient doors, that the King of glory may come in.  Who is this
King of glory? The Lord of hosts, he is the King of glory!     Selah    Psalms 24:3-10 (ESV)

Who shall (is able) to ascend the LORD'S hill? - Paul's answer: Romans 10:6-7 . Christ has ascended. The teaching of this Psalm and every Psalm is this: JESUS... He is the ONLY one with clean hands and a pure heart. He is the ONLY one qualified to ascend the LORD'S hill... That's why the gates are told to lift their heads and the ancient doors to the Holy City are to fling wide open... The LORD, strong and mighty, is entering in. He has ascended. When we trust in Christ, we are IN Christ... this means that we have clean hands and a pure heart. This means that we ascend the LORD'S hill. And this means that in Christ, we enter the Holy City.  How is this possible? It's too good to be true;
Again, Paul answers beautifully :  And you were dead in the trespasses and sins  in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience—  among whom we all once lived in the passions of our flesh, carrying out the desires of the body and the mind, and were by nature children of wrath, like the rest of mankind.  But God, being rich in mercy, because of the great love with which he loved us,  even when we were dead in our trespasses, made us alive together with Christ— by grace you have been saved—  and raised us up with him and seated us with him in the heavenly places in Christ Jesus,  He has made my hands clean and my heart pure.... I am in Christ!

Eph 2:1-7 (ESV)