Give Thanks Unto the Lord in all we do and say. No matter how we feel bad or good. No matter what we may be going through.If you Have confess Jesus Christ as your Lord and Saver and you are not stealing the tithes and offering which belong to him to take care the things of God's business. Leting your Charater,your Conduct, and your Commitment to your faith be shown in the way you live and though the word that come out of your mouth God will have mercy meaning compassion, Kidness, leniency over all your life situations his mercy will endureth meaning out last,continuing, presist, longsuffer in the will of God forever.
Good question. I think it refers to God the father. Some believe that in the old testament where it refers to 'An Angel of the Lord' that it refers to Jesus. You can see all instances of LORD here: Link Someone wrote a pretty good resource here: Link
different, this verse keeps me confident on who we should trust in.