"When Jesus had received the sour wine, he said, “It is finished,” and he bowed his head and gave up his spirit." - John 19:30
Whenever I drive past an unfinished building that appears to be abandoned I feel sad. Someone had dreams of a new venture that failed. The economy, unexpected events or just poor planning led to an unfinished project. The hopes someone had were gone and all they left behind was a deteriorating signpost that read "failure".
Thankfully, God knows no such concept as "failure". What he begins, he finishes. Jesus went to the cross on purpose and only when he "finished" the work of redemption did he give up his spirit. In the words of a builder, the work of Christ was a "turn-key" job. When you trust Christ for your salvation and eternal life, he just hands you the key. The project is complete; all you have to do is take residence.