The Lord chose Joshua because he is always looking for God, which is one of his characteristics, and thus make him hear the voice of God speak to him. If he's not focused, that God will give him the voice of God does not hear at all.
God chose Joshua For he is the one who seeks God. Which is one of his characteristics. Therefore, he Heard God speak to him. If he is not focused on God He will not hear the voice of God.
God chose him, because he is the one who seeks God always. Which is one of his characteristics, therefore, he heard the voice of God said to him, if he doesn't focus on God. That he didn't hear the voice of God .