The Valley of Baca

Blessed are those whose strength is in you, who have set their hearts on pilgrimage. As they pass through the Valley of Baca, they make it a place of springs; the autumn rains also cover it with pools. They go from strength to strength, till each appears before God in Zion. (Psalms 84:5-7)
This promise is addressed to the victorious saints. Their strength is in God. This is a mark of maturity. It takes a while before we learn how to rest on the everlasting arms. Such conquerors always are on a pilgrimage. They continually are pressing on the upward way.
As a result they keep on being strengthened until the holy city, Zion, is their permanent home.
Before they attain to full residence in Zion, they go through many sorrows. Instead of bemoaning the fact that they are facing numerous problems, they keep looking to the Lord Jesus until they rise in resurrection life. Thus their Valley of Baca overflows so those hearing them also experience resurrection life.
For we who are alive are always being given over to death for Jesus’ sake, so that his life may be revealed in our mortal body. So then, death is at work in us, but life is at work in you. (II Corinthians 4:11,12)
The "autumn rains," or former rains, speak of the operation of the Holy Spirit among young Christians. So the victorious believers who are pressing forward in Christ have the help of the Spirit of God until they themselves become sources of eternal life for other people.