You have to drag, bribe, or draft a social servant into battle. You have to kill a Bond Servant to get the sword out of their hand. The Bond Servant MUST serve. They are grateful to be chosen to serve. Excitement or not, they serve steadily and consistently.
Social servants plant a tree and get mad if there's no fruit in a week.
Bond Servants know that good fruit takes time, lots of water and sunshine, and even if no fruit is seen soon, it may just mean the roots are going deeper down. As time passes, the fruit of the heart becomes known. A social servant becomes increasingly meaner, prouder, more petty, selfish, critical and eventually bitter, lonely, empty and barren. You can remain a social servant. You'll get to heaven empty-handed.