How does Faith work since Jesus is the …?

How does faith work since Jesus is the founder and perfecter? Is there anything for us to do to let faith work or does Jesus do it all for us?
Once again, thanks for all the answers and some questions. It is a great blessing to me personally to know that you have spent time in the Word of God and have discussed the questions throughout the week with fellow believers.
Here is a summary of the answers given: one person answered: “to let faith work we need to lay aside every weight, and the sin which easily ensnares us, and let us run with endurance the race that is set before us. (Hebrews 12:1)
Another person answered: “Faith is the firm belief that Jesus is who He claims, that He has the authority to forgive sins, that He did die on the cross, etc. Without Jesus, there would not be saving faith! Faith is the assurance of what we hope for, Jesus gave us this joy when He rose from the grave.”
Faith has many different “faces”. Let me give you just a few from the Bible. First, faith is the medium through which we receive from God Almighty our salvation. The Apostle declares this truth in Ephesians 2:8-9.
Secondly, faith is also a fruit of the Holy Spirit according to Galatians 5:22. When faith operates in our lives, it draws us into close fellowship with Jesus. In other words, the operation of faith IS DEPENDANT upon our relationship with God. This is exactly what Jesus is teaching us in John 15:7 when he declared: “if you abide in Me, and My words abide in you, you will ask what you desire, and it shall be done for you.” The focus here is not on prayers to get what we want, but about ABIDING IN HIM AND HIS WORDS ABIDING IN US. This is done by faith as we trust him and His words.
A person once said that there are found foundations of Biblical faith. Here they are:
1. The Promises of God’s Word (2 Corinthians 1:20)
2. The Integrity of God’s Word (James 1:17)
3. The Ability of God’s Word (Romans 4:20-21)
4. The Confidence in God’s Word (Acts 4:4)
The initial saving faith is a gift from God to us. So is the gift of the Holy Spirit which produces “fruit”, one of which is faith. What must we do to increase that faith? Reading the written Word daily will increase our faith. Another way to increase our faith is by WALKING IN THE SPIRIT, which simply means letting yourself be guided by the Holy Spirit in all circumstances. Interestingly, the Holy Spirit will always bring to remembrance what IS WRITTEN IN HIS WORD, THE BIBLE. Keep reading and believing it!