From Puritan John Preston's short exposition of John 1:16 called The Fullness of Christ:

… [B]ut now Christ has ascended on high, led captivity captive, and has filled all things. In doing so, He has received and is giving gifts to men. All this is expressed in Ephesians 4:7-8: "But grace was given to each one of us according to the measure of Christ's gift. Therefore it says, 'When he ascended on high he led a host of captives, and he gave gifts to men."

Let us therefore be incited, when we hear of such a fullness, not to take the grace of God in vain, but strive to participate in it, with the Corinthians, that we may be made rich in Christ, being filled with all knowledge and every grace (2 Corinthians 8:6-9).

It is our common fault to rest in the notion of such things without experiencing them in practice. Therefore, we ought not be content with simply knowing this, but we should go to Christ, as bees to a meadow full of flowers or as merchants to the Indies, that are full of wines and spices. May you then feel experimentally what it is to return from him filled up with treasures of truth and grace.

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