Are we working it out?

Philippians 2:12 Therefore, my beloved, as you have always obeyed, so now, not only as in my presence but much more in my absence, work out your own salvation with fear and trembling,

What blows my mind is the "work out your salvation" and then the "fear and trembling" parts. We don't often think we have to work out anything , we receive what Christ did for us on the cross and then, We kinda relax , waiting for His return or for our departure. However, the word of God says we need to work it out. This reminds me of what Paul meant when he said " I die daily" and John the Baptist said " He must increase I must decrease. Is there more of me today or more of Jesus in me today? Am I really trying to die to myself and live for Christ every moment? Do i still seek after what i want? Lord Jesus change my heart fill it with an overwhelming love for you!