In Matthew 13:31-32, Jesus told the short parable of the mustard seed. He said that even though it’s the smallest of garden seeds, it produces the largest of garden plants. And indeed the size of the seed does not determine the size of the tree.
Jesus Himself was a solitary human being but He has become the God who rules all creation. He accomplished this through His resurrection and return to the glory which He had as God before He became Jesus in the first place.
“Do not despise the day of small beginnings,” says the prophet of old (Zechariah 4:10).
Jesus is indeed the Mustard Seed. Start with Him however small your understanding of Him, and if you hold fast to Him, you will eventually understand His greatness.
How do you start with Him? Keep His commandments. What are His commandments? Love. Just be sure to love for His approval, and not the approval of others.