The Catechism in Questions & Answers

106. Which of His deeds show that Jesus Christ is true God?

The miracles that He performed show that Jesus Christ is true God. Nature was subject to Him because He calmed a storm and walked on the waters of Lake Gennesaret. He showed Himself to be Lord over life and death by healing the sick and raising the dead. When He multiplied the loaves and fish and thereby fed thousands of people, and when He turned water into wine, His actions far surpassed the capacities of any human being. He was Lord over sin and repeatedly forgave sins.

Jesus’ miracles: see Questions 140. et seq.

“God was manifested in the flesh.”
1 Timothy 3:16
“This (Jesus Christ) is the true God and eternal life.”
1 John 5: 20