When the Bible says, "Work out your Salvation with fear and trembling" it doesn't mean to gradually get closer to God. It means to work out what God already "worked within you".Phil 2:12-13...as ye have always "obeyed", not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling. For it is God which worketh in you both to will and to do of his good pleasure.
Notice the language of the scripture. Paul commended the Phillipian church because they "always obeyed". What caused these believer's in Christ, to obey God? God had already performed the work of Salvation within those hearts and lives. The Phillipian Church was saved. They were filled with the fruits of righteousness. Paul was confident of this, because he knew what God had already given them. He knew Divine Grace that flowed from Calvary was enough to sustain these believers, all the way through life...until the day of Christ's return.
Phil 1:6...Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ:
Phil 1:10-11...That ye may approve things that are excellent; that ye may be sincere and without offence till the day of Christ; Being filled with the fruits of righteousness, which are by Jesus Christ, unto the glory and praise of God.
You can be filled with the fruits of righteousness in this life. You can obey God every day of your existence. You can have assurance and confidence that Salvation is the beginning of the new heart and new life. This is the blessing of Salvation and obedience to God. This is the new heart and the new life the Bible teaches about. This is obedience to God that the world doesn't have or know about. You can live victorious! You can have contentment found in the holy life! You can walk and live with obedience to God every day of your existence in Christ! Be blessed by the power of God's Grace! This is what the Bible teaches! Read it closely! Meditate on it! Glory!