SALVATION Philippians 2:12-13

Therefore, my dear friends, as you have always obeyed--not only in my presence, but now much more in my absence--continue to work out your salvation with fear and trembling, for it is God who works in you to will and to act in order to fulfill his good purpose. 

continue to work out your salvation with fear and trembling 
2 Corinthians 7:15  And his (Titus') affection for you is all the greater when he remembers that you were all obedient, receiving him with fear and trembling.

for it is God who works in you to will and to act 
Ezra 1:5  Then the family heads of Judah and Benjamin, and the priests and Levites--everyone whose heart God had moved--prepared to go up and build the house of the LORD in Jerusalem.
1 Corinthians 12:6  There are different kinds of working, but in all of them and in everyone it is the same God at work.
1 Corinthians 15:10  But by the grace of God I am what I am, and his grace to me was not without effect. No, I worked harder than all of them--yet not I, but the grace of God that was with me.
Galatians 2:8  For God, who was at work in Peter as an apostle to the circumcised, was also at work in me as an apostle to the Gentiles.
Hebrews 13:20-21  Now may the God of peace, who through the blood of the eternal covenant brought back from the dead our Lord Jesus, that great Shepherd of the sheep, equip you with everything good for doing his will, and may he work in us what is pleasing to him, through Jesus Christ, to whom be glory for ever and ever. Amen.

in order to fulfill his good purpose 
Ephesians 1:4-6  For he chose us in him before the creation of the world to be holy and blameless in his sight. In love he predestined us for adoption to sonship through Jesus Christ, in accordance with his pleasure and will--to the praise of his glorious grace, which he has freely given us in the One he loves.

(parentheses are mine)

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide.