For the one whom God has sent speaks the words of God, for God gives the Spirit without limit.
The words which Jesus speaks are not human, but divine. Why is this important?
“without limit” = God has given the Holy Spirit in His absolute fullness to the Son. This again guarantees the truth of what He says. This also says that God gives the Spirit to the Son without measure as opposed to how He gives Him to everyone else. It implies that we are not given the Spirit without measure; i.e. there is a limitation to the giving of the Spirit to the believer. No one else receives the Spirit in a way comparable to that of the Son. How does this compare us with Jesus?
Eph 4:7 But to each one of us grace has been given as Christ apportioned it.