"It’s okay not to be okay — but it's not okay to stay there" (Matt Chandler, HT Justin Taylor)
Isn't that great?!
Our lives are characterised by suffering and sin. The cross overshadows all of us and it is more than "okay", it is good for us to see ourselves in the place of the cross and not deny that we are under the curse of death.
But, it is not okay to stay there because if we are on a journey with Jesus we have hope of three days later rising from the dead to a new life of praise and thankfulness in the presence of God.
In some churches it is not okay to be miserable and to mourn, either for suffering ("earth is not our home") or our sin ("everyone sins, you're not that bad"). In other churches there is no joy over the good things in creation ("earth is not our home") or the good things of redemption ("displays of emotion are not necessary in worship"). It is good for a church to be marked by both in a constant re-telling of the Gospel story of death to life. And the movement from one to another is important because that shows that life with God is our goal, and suffering is only the way we walk to get there. We repent of our sin so we can have faith in Christ, and we mourn at loss so we can rejoice consistent with that when what we lost is restored to us.
Most spiritual issues that I see people struggle with are a result of not "moving on" in this Gospel-story way. They are trapped in self-hatred, introspection and sorrow over the life they have been dealt. Most spiritual issues that I see people not struggle with is an avoidance of the narrow way of the cross. They think they're okay and probably would get on fine without God's help, because they haven't committed any terribly bad sins and they've got their health and wealth. I think I fall into both categories of person.