Those who read Morning Prayer with any regularity will recognize this canticle. (note: the BCP says Morning and Evening Prayer is to be daily; and because our liturgy is common prayer - meaning for laity and clergy, men and women, old and young alike - every Anglican should make an effort to read Morning and Evening Prayer every day)
It is the long canticle - the one we all probably say the least because of the big rush and hurry we Americans are always in. I must confess that I find myself saying this canticle (which comes from the Apocrypha) the least too. But I do make an effort to say it at least once a week, and everytime I do I am glad I said it! It speaks of all nature and creation praising God. It may be viewed, perhaps, as a primitive Natural Theology: all of creation testifies to God's Lordship, and through nature we can come to know God on a basic level. Nature is our "interface" with God - such as with the elements of Bread and Wine becoming the Body and Blood of Jesus Christ.
Last night the power went out, and I lay bed for 5 hours sweating... barely able to breathe because of the awful heat and humidity. Then this morning, when I said the Benedicite, I was reminded that the "...winter and summer..." is to bless the Lord, and praise and maginfy Him forever (BCP p.12). Even the oppresive, sweltering heat, which was crushing me and keeping me awake, must bend the knee to Almighty God.
So, if you do not read Morning and Evening Prayer regularly, start doing it. Then, when you do it, don't shy away from the longer canticles. They have much to teach us.
