The other day I was praying and told God, "I'd do anything for you!" As I said it, I remembered Peter making a similar declaration at the Last Supper and Jesus saying, "Will you?" and then predicting that Peter would deny Jesus three times that night before the rooster crowed.
As I reread the passage about it, I wondered if Jesus wanted to tell Peter, "Tonight, you don't have to give your all. You just have to say you know me." Tradition tells us that later Peter died for the sake of Christ and was crucified upside down because he didn't consider himself worthy to be killed in the same manner as Jesus. Peter did have to give it all one day. Just not the night of the Last Supper.
Earlier that night at the Last Supper, Jesus washes the disciples' feet and as He gets to Peter, Peter again asks for more. "Wash my whole body then if you must!" But Jesus tells Peter for someone who has already been washed, they only need to get their feet cleaned. It's enough. You don't have to do it all. Just what Jesus leads you to.
My desire to give my all for Jesus I think is good. Certainly, He says that if anyone wants to be His disciple he has to deny himself, take up his cross and follow Jesus. It's just that day-to-day, that "giving-it-all" might be giving something very small. My time. My attention. My affection. Today, I may not need to make a big declaration but instead ask Jesus for His help to in small ways and big to keep following Him.