The hymn was written in 1870
http://cyberhymnal.org/htm/j/l/jlovesem.htm
I am so glad that our Father in Heav'n
Tells of His love in the Book He has giv'n;
Wonderful things in the Bible I see,
This is the dearest, that Jesus loves me.
Refrain
I am so glad that Jesus loves me,
Jesus loves me, Jesus loves me.
I am so glad that Jesus loves me,
Jesus loves even me.
Though I forget Him, and wander away,
Still He doth love me wherever I stray;
Back to His dear loving arms I do flee,
When I remember that Jesus loves me.
Refrain
Oh, if there's only one song I can sing,
When in His beauty I see the great King,
This shall my song through eternity be,
"Oh, what a wonder that Jesus loves me!"
Refrain
Jesus loves me, and I know I love Him;
Love brought Him down my poor soul to redeem;
Yes, it was love made Him die on the tree;
Oh, I am certain that Jesus loves me!
Refrain
If one should ask of me, how can I tell?
Glory to Jesus, I know very well!
God's Holy Spirit with mine doth agree,
Constantly witnessing Jesus loves me.
Refrain
In this assurance I find sweetest rest,
Trusting in Jesus, I know I am blessed;
Satan, dismayed, from my soul now doth flee,
When I just tell him that Jesus loves me.