There is a great contrast between sin - “Do not trust your brothers. For every brother is a deceiver ... and no-one speaks the truth” ( Jeremiah 9:4-5 ) - and salvation - “the holy and faithful brothers in Christ ... the Words of truth, the Gospel ... has come to you” ( Colossians 1:2 , 5-6 ). God is calling us from sin to salvation, and then on to service. Those who say, “I will lift up the cup of salvation” go on to say, “O Lord, I am Your servant” ( Psalm 116:13 , 16 ). This service is offered to the Lord in gratitude for His salvation,. We acknowledge Him as Saviour, saying, “You have freed me from my chains”, and we say to Him, “I will sacrifice a thank-offering to You” ( Psalm 116:17 ).