Who is God and the Holy Trinity?
He is an absolutely pure spirit, invisible, without body, parts or passions. He alone has immortality, living in light which no one can approach. He is immutable, immense, eternal, incomprehensible, almighty, in every way infinite, perfectly holy, perfectly wise, absolutely free, completely absolute. He works all things according to the counsel of His own immutable and entirely righteous will for His own glory. He is perfectly loving, gracious, merciful, long-suffering, abundant in goodness and truth; He forgives iniquity, transgression and sin. He is the rewarder of those who diligently seek him, yet at the same time He is entirely just and terrible in His judgments, hating all sin, and He will by no means clear the guilty.
God has all life, glory, goodness, blessedness in and of Himself; He is unique in being, all-sufficient in and to Himself, not standing in need of any creature which He has made, nor deriving any glory from them, but rather demonstrating His own glory in them, through them, to them, and upon them.
He alone is the source of all being, from whom, through whom, and to whom are all things; He has absolute sovereign dominion over all creatures, to do through them, for them, or to them whatever He pleases. In His sight all things are open and plain, His knowledge is infinite, infallible, and independent of created beings, so for Him nothing is contingent or uncertain. He is perfectly holy in all His plans, in all His works, and in all His commands.
In this divine and infinite Being there are three persons, the Father, the Son (or the Word) and the Holy Spirit.They are one in substance, power, and eternity, each having the whole divine essence, yet this essence is undivided.
The Father is not derived from anyone, He is neither begotten nor proceeding; the Son is eternally begotten of the Father; the Holy Spirit proceeds from the Father and the Son. All three are infinite, without beginning, and therefore but one God, who is not to be divided in nature and being. Yet they are distinguished by several distinctive characteristics and personal relations.
This doctrine of the Trinity is the foundation of all our fellowship with God, and of the comfort of our dependence on Him.