The apostle Paul knew the saints of God and desired to greet them by name. This serves as a tremendous demonstration of brotherly love!
The Bible often defines words through their associations. For instance, the words salute, saluteth, and salutation involve a greeting.
There are times when we attempt to do the right thing only to have our motive judged as impure. In such times, we can learn much from David's example.
How would making your motive match the Lord's motive change how you approach the Christian life (from witnessing to praying to Bible reading and so on)?
It takes a person with strong conviction to be willing to die for a cause. However, the one martyred is not necessarily a mature and complete Christian.