I am so glad that my relationship with God is not based upon my performance! So I don't have to be worried or fearful that I may fall in and out of his favor.
It would grieve me to think that I would not choose to be a close friend and follower of Jesus, but just like my salvation was because of his grace and not my performance, my life here on earth is about his grace and not my performance.
Some, knowing heaven is a free gift, accept that gift and then, snap snap, jump on the treadmill of performance and guilt and a level of expectation to which they will never be able to live up to.
If we actually fell into God's favor because of our performance, we would be able to brag about it. Rather, like his free gift of salvation, it is Jesus' performance and his grace that we rest in and boast about!