While traditionally attributed to Saint Casimir of Poland because of his profound devotion, scholars now identify Saint Bernard of Cluny (12th century) as the likely author. Casimir popularized it, allegedly praying it daily on his knees.
The hymn encourages a life of constant prayer and total reliance on Mary as a powerful intercessor. Daily, daily sing to Mary | Hymnary.org Daily, daily sing to Mary
The most popular English version was translated by Fr. Henry Bittleston around 1854. While traditionally attributed to Saint Casimir of Poland