God's plan is not an afterthought. His plan is well calculated and was formed before the need arose.

“All who dwell on the earth will worship him, whose names have not been written in the Book of Life of the Lamb slain from the foundation of the world.” (Revelation 13:8)

“just as He chose us in Him before the foundation of the world, that we should be holy and without blame before Him in love, having predestined us to adoption as sons by Jesus Christ to Himself, according to the good pleasure of His will.” (Ephesians 1:4-5)

“He indeed was foreordained before the foundation of the world, but was manifest in these last times for you.” (1 Peter 1:20)

“who has saved us and called us with a holy calling, not according to our works, but according to His own purpose and grace which was given to us in Christ Jesus before time began” (2 Timothy 1:9)