He accomplished all these purposes, two thousand years ago and everyday since. He demonstrated God's love with everything He did - discipling outcasts, reaching out to outcasts, healing people, feeding people, teaching people. 

He brought the Good News to others by what He taught and did, by dying on the cross and rising again to complete and prove His message.

He sacrificed Himself for others by living His early years as the perfect child, under His human parents, though He was God.  He devoted His time and energy to His ministry, not having a source of income or home, but relying on others.  He never made much of Himself, but pointed to the Father.  He died on the cross, rose, and taught the disciples.  He made little of Himself so that others may benefit.

He is a source of abundant life all His friends, family, and disciples of His time and all His current followers now, if we would all turn to Him and put everything for Him, rather than for ourselves.  He is the source of abundant life because of what He reveals to us to do and His help to do it.  For example forgiveness.  He tells us to forgive and helps us to forgive when we ask and this is part of the path to abundant life because you cannot have abundant life hanging onto bitterness and unforgiveness.

He helps people understand the Kingdom of God by living it and pointing it to the Father.  We cannot know what the Kindgom of God is without seeing it and how it looks like.  Because Jesus lived the Kingdom of God life (and we have a record of it), the disciples in the past and followers who read the Bible can see what it looks like and how to do it too.