Whatever problem you’re facing today, the Lord can bear it for you. You simply have to “take Him at His Word” and “rest upon His promises.” That’s what sustained Louisa Stead through years of missionary service and personal tragedy, including the accidental drowning of her husband (which reportedly led to her writing this hymn). Later, while working in South Africa, she met and married Robert Wodehouse. The two returned to America in 1895 for health reasons, but after attending a large conference in New York, they felt compelled to offer themselves as missionaries once again. On April 4, 1901, they arrived in Rhodesia (Zimbabwe), ready to invest their remaining days in overseas missions, borne along by the truth of Louisa’s song.
’Tis so sweet to trust in Jesus,
Just to take Him at His word;
Just to rest upon His promise,
Just to know “Thus saith the Lord!”
O how sweet to trust in Jesus,
Just to trust His cleansing blood;
Just in simple faith to plunge me
’Neath the healing, cleansing flood!
I’m so glad I learned to trust Thee,
Precious Jesus, Savior, Friend;
And I know that Thou art with me,
Wilt be with me to the end.
Jesus, Jesus, how I trust Him!
How I’ve proved Him o’er and o’er!
Jesus, Jesus, precious Jesus!
O for grace to trust Him more!

As for God, His way is perfect; the word of the Lord is proven; He is a shield to all who trust in Him.
2 Samuel 22:31

Morgan, R. J. (2013). Devotions for lent (ebook shorts): meditations based on best-loved hymns. Grand Rapids, MI: Revell.