We can begin a list like the air we breathe, scenes of beauty that we see, the gift of our Savior or the land we live in. Upon closer examination it becomes clear that it is a wonderful life, but you can't live for nothing. We need to pay taxes for services, we need to buy food to eat so that we are healthy, and travel can be costly. No doubt the greatest "free" gift ever given to mankind is the freedom Jesus Christ has given us (Galatians 5:1 Galatians 5:1Stand fast therefore in the liberty with which Christ has made us free, and be not entangled again with the yoke of bondage.
American King James Version×).

The free gift of grace through Christ is there for the taking—but only if we pay the cost. We need to believe in this gift, repent of our sins, be baptized and then live in a way that is pleasing to God. That was the direction given by Peter when he was asked what could be done (Acts 2:37-39 Acts 2:37-39 [37] Now when they heard this, they were pricked in their heart, and said to Peter and to the rest of the apostles, Men and brothers, what shall we do? [38] Then Peter said to them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and you shall receive the gift of the Holy Ghost. [39] For the promise is to you, and to your children, and to all that are afar off, even as many as the LORD our God shall call.
American King James Version×). Everything has a cost and we are left to judge whether the price being asked is worth the cost we must pay. Eternal life certainly is worth all.