Come Thou Fount!

In "Come Thou Fount" I found one allusion in the lines from "Jesus sought me as a stranger" to "Mortal tongue can never tell." I think these lines are referencing before Jesus came that we were lost as a stranger to God because we were so lost in the world and he finds us and sacrifices himself on the cross as pursuing us. It is so great that ortal person can tell how great that was.
Another good one I found was in the lines "Prone to Wander" to "Seal it for thy courts above." I think the author is portraying that we can't stay with God by ourselves. We are made to wander away from him and leave him so we ask him to almost shackle our hearts hime (like a fetter) and to mold and seal our hearts to stay with him for his purpose.
and FINALLY, the allusion to "HERE I RAISE MY EBENEZER" is a reference to Samuel chapter 7 where  Samuel takes a stone and calls it Ebenezer to help defend against the Philistines to keep them out of Israel territory. God had his hand against the Philistines so they wouldn't invade. So the author is calling on the help of God to have him "safely arrive home."