The Trinity

After Judas left, Jesus said to the remaining 11: "All authority has been given to me in heaven and on earth. Go, and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all things that I commanded you. Behold, I am with you always, even to the end of the age." — Matthew 28:18-20

I'm going with the three-in-one oil analogy on this one.

Three-in-one oil was invented in 1894 by the inventor George W. Cole of New Jersey.

Its name is derived from the oil's ability to clean, lubricate and protect. Originally, the oil was used for bicycles.

How is the Trinity like three-in-one oil? Faith in God frees us from sin's hold on us. As a result, we become spiritual cleansed of sin. This arises from the belief that Jesus died for our sins.

What part of the Trinity is like lubrication? The Holy Spirit moves the godly to act, speak and think in a way which respects God, holds other people in high respect and moves one to behave, speak and think in a loving and kind manner.

Indeed, in the Bible, oil represents the Holy Spirit:

"The Spirit of the Lord GOD is on me;
because the LORD has anointed me to proclaim good news to the humble.
He has sent me to bind up the brokenhearted,
to proclaim liberty to the captives,
and release to those who are bound..." — Isaiah 61:1

At the root of this is God's love for us because He is our protector. However, all of this refers to the spiritual realm, the deeper meaning of God in the believer's life.

For God is great in that He is Jesus, He is the Holy Spirit and He is the Father; yet He is all-loving but harms none.

---

References:

3-in-1 oil: http://www.3inone.com/about/history/

Oil as a symbol in the Bible represents the Holy Spirit: http://www.bibletools.org/index.cfm/fuseaction/Topical.show/RTD/cgg/ID/1107/Oil-as-Symbol.htm

Trinity: God in three persons: http://en.wikipedia.org/wiki/Trinity#God_in_three_persons

Hypostatis: http://en.wikipedia.org/wiki/Hypostasis_(religion)