It’s a tough question, and one that’s hard to understand. We wrestle with this because when we think of God we think of His power, magnificence, His ability to be everywhere, know everything, etc. So, how is it possible for Jesus to be all of this and yet man at the same time?
The way Jesus could be both 100% God and 100% man is because He has the nature of both of these. In other words, He had characteristics that can/should belong only to God. He had superior knowledge and could read into people’s hearts (John 2:24-25). He knew the future (Matthew 26:31-35). He had power over angels and demons (Matthew 4:5-7; Mark 1:21-28). He had power over nature (Matthew 8:23-27; 14:22-33). He had power over sickness (Matthew 8:1-4; 9:1-8; 12:9-14) He had power over death (John 11:1-45; Matthew 28:1-20). He could bring eternal life to humanity (John 10:28). He was sinless (1 Peter 2:22; Hebrews 4:15). He accepted worship (Matthew 2:2, 11, 14:33). He accepted being called God and the Son of God (John 20:28; Mark 1:1; Hebrews 1:8). Jesus displayed what we would expect to see in deity.
The way He was 100% man was because He had the nature of man. He had the characteristics of a human. He was born physically and from a human mother (Matthew 1:18-25). He had to grow up from a child (Luke 2:39-52). He was tempted (Matthew 4:1-11). He got hungry (Matthew 4:2). He got thirsty (John 19:28). He got tired (John 4:6; Matthew 8:24). He cried (John 11:35). He had a physical body of flesh and bone (Luke 24:39). He died (Matthew 27:33-50). Everything that we deal with as humans, Jesus went through because He was a man (Hebrews 4:15; 2:17-18).
Colossians 2:9 sums it up really well, “For in Him all the fullness of Deity dwells in bodily form.” Jesus was fully God, but the form in which His deity dwelt on this earth was in a physical body. Jesus is all deity and at the same time he was a physical man.
We have trouble fully grasping this because we all have only one nature, human. We don’t really know what it would be like to have two, but Jesus did. Without a doubt, Jesus is both God and man. It is only because of this that we are able to have forgiveness of sins. He was the only man to live perfectly, and since He was also God, it made Him the sacrifice that was needed to bring us salvation (Hebrews 10:10). Let’s praise God for tremendous plan and sacrifice!