This canticle was introduced in the 1979 Prayer Book and recommended to be used as the first Canticle in Morning Prayer on Mondays, and the first Canticle in Evening Prayer on Saturdays, the former being drawn from its use in the Mozaribic rite.

Surely, it is God who saves me; * I will trust in him and not be afraid.
For the Lord is my stronghold and my sure defense, * and he will be my Savior.
Therefore you shall draw water with rejoicing * from the springs of salvation.
And on that day you shall say, * Give thanks to the Lord and call upon his Name;
Make his deeds known among the peoples; * see that they remember that his Name is exalted.
Sing the praises of the Lord, for he has done great things, * and this is known in all the world.
Cry aloud, inhabitants of Zion, ring out your joy, * for the great one in the midst of you is the Holy One of Israel.
Glory be to the Father, and to the Son, and to the Holy Spirit; *
as it was in the beginning, is now, and ever shall be, world without end. Amen.

The hymn of praise in Isaiah 12 does not point explicitly to any particular act of redemption or work of God.  Rather, it is more general in its concern.  The first few verses express trust in God’s salvation, defense, and provision.  Even if there is trouble, the believer need not be afraid, and will be seen through every danger to “give thanks to the Lord and call upon his name” on the day of deliverance.  Based on that, the worshiper is exhorted to share the news with others, and “see that they remember.”  We always can (and should) give thanks ring out our joy because God is in the midst of us.