This is what God gave me today in His word:
What man is there who desires life and loves many days, that he may see good? Keep your tongue from evil and your lips from speaking deceit. Turn away from evil and do good; seek peace and pursue it. The eyes of the LORD are toward the righteous and his ears toward their cry. (Psalms 34:12-15)
In the previous couple of chapters, and even in the previous couple of verses in this chapter, David has talked about trusting entirely in God. Now he’s talking about ways in which to obey God in day-to-day life; i.e., keeping our tongue from evil, not speaking deceitfully, doing good, and seeking peace.
Of course, it is important to keep in mind that David was living under the Old Covenant, and thus was always attempting to work his way into Heaven. This means, quite simply, that while David is doing these things so he can try to earn the blessing of God, we ought to do them because we know we already have been blessed by God.
Jesus gave up His very life for us, it is thus our reasonable act of worship (see Romans 12:1-2) to offer our lives to Him. David gives us specific ideas on how to not disobey God (i.e. not sinning with our mouth, turning away from evil, etc..), and he didn’t even know Christ! How much more than should we who do know Him be willing not only to avoid disobedience, but to answer when He calls us to some form of service?