One of the issues that drew the most persecution for Joseph Smith was the subject of the nature of God.  The Nicene Creed describes a God which is incomprehensible and impersonal.  It depicts our Heavenly Father as some sort of conglomeration of personalities manifest in different scenarios for different reasons.  The description is so convoluted that the reader will find little in it that will clarify for them the nature of the God that they desire to worship.
 

In contrast, Joseph Smith testified that in a vision he saw the Father and the Son.  Said he, 

"I saw a pillar of light exactly over my head, above the brightness of the sun, which descended gradually until it fell upon me.  When the light rested upon me I saw two personages, whose brightness and glory defy all description, standing above me in the air. One of them spake unto me, calling me by name and said, pointing to the other—This is My Beloved Son. Hear Him!"

Joseph described the Father and the Son as having bodies of flesh and bone.  He taught about a sensual God--one who has feelings and emotions.  A real being in whose image we have been created, and with whom we can develop a very personal and caring relationship.  For this and other reasons Joseph was persecuted and hated because he said that he had seen a vision.  Writing his personal history, Joseph reflected on his experience and the reaction he received from others.

"I had actually seen a light, and in the midst of that light I saw two personages, and they did in reality speak to me; and though I was hated and persecuted for saying that I had seen a vision, yet it was true; and while they were persecuting me, reviling me, and speaking all manner of evil against me falsely for so saying, I was led to say in my heart: Why persecute me for telling the truth? I have actually seen a vision; and who am I that I can withstand God, or why does the world think to make me deny what I have actually seen? For I had seen a vision; I knew it, and I knew that God knew it, and I could not deny it, neither dared I do it; at least I knew that by so doing I would offend God, and come under condemnation."

So let us compare the Nicene Creed, the document created by 4th century religious thinkers to attempt to agree on one definition of God, and what the Holy Scriptures teach.  Here is the Nicene Creed of 381 AD with the Filioque Clause.

"We believe in one God the Father Almighty, Maker of heaven and earth, and of all things visible and invisible.   And in one Lord Jesus Christ, the only-begotten Son of God, begotten of the Father before all worlds, God of God, Light of Light, Very God of Very God, begotten, not made, being of one substance with the Father by whom all things were made; who for us men, and for our salvation, came down from heaven, and was incarnate by the Holy Spirit of the Virgin Mary, and was made man, and was crucified also for us under Pontius Pilate. He suffered and was buried, and the third day he rose again according to the Scriptures, and ascended into heaven, and sitteth on the right hand of the Father. And he shall come again with glory to judge both the quick and the dead, whose kingdom shall have no end.   And we believe in the Holy Spirit, the Lord and Giver of Life, who proceedeth from the Father and the Son, who with the Father and the Son together is worshipped and glorified, who spoke by the prophets. And we believe one holy catholic and apostolic Church. We acknowledge one baptism for the remission of sins. And we look for the resurrection of the dead, and the life of the world to come. Amen."

Now a short list of scriptures that illustrate the plain and simple nature and relationship of God the Father, His son, Jesus Christ, and the Holy Ghost.

From the King James Version of the Bible
Genesis 1:26 - let us make man in our image.  Who are us?
Matthew 3:16-17 - Jesus, the Father, and the Holy Ghost all acting independently on one occasion.
Matthew 20:23 - Jesus did not have authority to grant the right to sit at the Father's right hand.
John 17:20-23 - Jesus prays that His disciples can be one even as he and the Father are one.
Acts 7:55-56 - Stephen sees Christ standing on the right hand of God.

The scriptures do not support the confusing and disjointed language of the Nicene Creed.  Our Heavenly Father and Jesus Christ and the Holy Ghost are one in purpose, thought, and word.  They are not one in body or essence.  Modern revelation confirms the teachings of the Bible vis-à-vis the prophet Joseph's many visions and revelations.  He knew by first-hand experience with the divine that we worship the living God through his living son, Jesus Christ.  Joseph's simple testimony of Christ was: "This is the testimony, last of all, which we give of him: That he lives!  For we saw him, even on the right hand of God."  Based on such knowledge Joseph observed, "[if you] could . . . look into heaven for five minutes you would know more than all that has been written on the subject." (HC 6:50)

I invite you to go to your Heavenly Father in humble prayer and ask Him in the name of his beloved son, Jesus Christ if these things are true.  And if you will ask sincerely, I promise that the Father will make the truth of it known to you by the power of the Holy Ghost.  "And by the power of the Holy Ghost you may know the truth of all things."  (Moroni 10:5)