Isaiah 12:1

Isaiah 12:1 says, And in that day thou shalt say, O Lord, I will praise thee: though thou wast angry with me, thine anger is turned away, and thou comfortedst me.  In that day here refers when a person comes to Christ for salvation first and then to the day that He returns to claim His church I believe.  We who were lost once we are born again into the family of God should begin to give Him our praises, because He had been angry at the sin in our lives, but it is now forgiven.  Once we accept Jesus Christ as our personal Savior and Lord, the anger of God is turned away from us because Jesus Christ has paid the penalty for our sins.  Our complete rejoicing will be when He comes again to take us home to heaven. 

Verse two adds, Behold, God is my salvation; I will trust, and not be afraid: for the Lord Jehovah is my strength and my song; he also is become my salvation.  Isaiah said that God was his salvation, and he would trust in Him and not be afraid.  He also said that God was his strength and his song, or reason to rejoice. Through Jesus Christ alone can we have salvation and because of our accepting His gift of salvation, we should not be afraid of anyone or anything in life, not even death itself.  We are already forever victorious, and this is the reason we should sing praises to God. 

Verse three continues, Therefore with joy shall ye draw water out of the wells of salvation.  Jesus Christ is the living water, and we should draw out of this living water, which is the well of salvation, to quench our spiritual thirst. 

Verse four states, And in that day shall ye say, Praise the Lord, call upon his name, declare his doings among the people, make mention that his name is exalted.  Matthew Henry says this refers to the deliverance of the people of Israel from Sennacherib at that time but more importantly the deliverance of those who put their faith in Jesus Christ from their enemies for all time.  We as Christians are to rejoice not only individually but also as groups who gather to worship God. This rejoicing should not be based on any material blessing from God but on His sending His Son, Jesus Christ, to die for our sins. 

Verse five adds, Sing unto the Lord; for he hath done excellent things: this is known in all the earth.  We should rejoice in God because He has done excellent things which is known to all the earth, even if many people want to deny His existence.  God makes Himself known even through creation, even if many people try to explain this great work of God away.  I say this because the Bible says that no one will be able to claim that God did not make Himself known to them. 

Verse six continues, Cry out and shout, thou inhabitant of Zion: for great is the Holy One of Israel in the midst of thee.  As the people of Israel were told to do then at their deliverance from Sennacherib by the power of God, we as followers of Christ today need to shout out to the world about the salvation of Christ.  It is only through the power and grace of God that we can be spiritually delivered from sin and death, and because of that deliverance, we need to let the world know about the greatness of God.