Our lives drastically change from the moment that we enter into a covenant. 
The good news about covenants is that believers have a covenant with God! We have a better covenant (shedding of blood) than they had in the Old Testament or under the old covenant because the blood that was shed for us is the blood of the Lord Jesus Christ. You and I, as believers, haven't entered into a covenant with men, we have entered into a covenant with the Father God. On the day that Jesus shed His substitutionary blood for us, the blood from our hands mingled with His. In other words, we shook hands with God.

But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises. For if that first covenant had been faultless, then should no place have been sought for the second. (Hebrews 8:6-7)