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The mitzva of emuna, faith, is to believe in the existence of the Creator, Who is the primary and sole source of the universe, including the dimension of time. God is one in that He is unified and unique. His exclusivity means there is none other after Him and He is not composed of multiple facets. He is infinite, has no form, and cannot be categorized or defined. All names and descriptions attributed to God in the Torah are God's revelation to us based on our limited human understanding, but they do not describe His essence.
Because God is one, we learn that all the distinct creatures are united at their core. Therefore, it is appropriate for people to exist with love for each other, and to reflect the harmony within creation by helping one another.
Because God is infinite, humanity continues to derive its endless aspiration to elevate and perfect itself.
Because God is unique and cannot be categorized, we learn that he reveals Himself in every category of creation from heaven above to earth below without exception. Every single thing is important because it contains a unique divine spark which animates it. People which were created in the image of God, should reveal this spark in its full glory.
Because God created time, we learn that the divine element is revealed at all times, with different times reflecting distinct aspects of the divine.
Due to the fundamental importance of faith, it is the subject of the first two of the Ten Commandments. The first is to believe in God, Who took us out of Egypt. The second is not to worship idols or make them.
