Oh, Christian, never for a moment entertain the thought that God will let you fall. For a child of God to doubt His love, His trustworthiness, His persistence, His will to uphold you and keep you forever from sin... this must grieve his heart terribly.

All the blessings of God, mercy, joy, fellowship, peace, come to those who put their trust in Him, leaning upon his good grace.:
“He who trusts in the Lord, mercy shall compass him about.” (Psalm 32.10)
“Our heart shall rejoice in Him, because we have trusted in His holy name.” (Psalm 33.21)
“And our fellowship is with the Father and with his Son, Jesus Christ.” (1 John 1.3)
“My presence shall go with thee and I will give you rest.” (Exodus 33.14)

What a fellowship, what a joy divine,
Leaning on the everlasting arms.
What a blessedness, what a peace is mine,
Leaning on the everlasting arms.

You may play this as fast as you are able, but the last line has a transition difficult for players who exceed their ability. I recommend a comfortable speed, just a little more lively than congregations normally sing. Play with a medium degree of lightness, that is, slightly staccato, in order to bring out the joy. The ornamental passages marked “less” in the second half should be reduced a little in volume and focus to make them recede from the melody.