Here is the refrain of this hymn:
Trust and obey, for there's no other way To be happy in Jesus, but to trust and obey.
The complete lyrics can be found at GreatChristianHymns.com.
This refrain reminds me of Paul’s admonition in 2 Corinthians 11:3 (NASB) where he encourages the disciples in Corinth not to stray from “the simplicity and purity of devotion to Christ.” (Teachers of the Trinity take note.)
Truly, this hymn refrain is a faithful summation of what the Bible would have us to do.
That everyone is going to heaven is no excuse whatsoever for disobedience to, or disregard of, Christ. Far from it, let us “love Him with a love incorruptible” (Ephesians 6:24).
To learn more about Christ versus the Trinity, see: