It's easy to think Jesus didn't need faith. If He was God, He knew everything and didn't have to worry right? But without faith it is impossible to please God, and God Himself said He was well pleased with Jesus. So He must have had to rely on some faith in His time here. 

When Jesus was on earth, He voluntarily surrendered some of His God-like attributes, coming down to our level in some ways. This makes His faithfulness to the Father all the more incredible! We can't use the excuse "well, yeah, but He was Jesus" when we can't find the ability to live the way He told us to live. He lived by example, struggling with temptation without surrendering to it. 

When we can't find the power to do this on our own, God reminds us that "on our own" was never His plan.