Life has its ups and downs surely enough. When are loved ones suffer from disease, when we face bereavement over lost loved ones, when we endure hardship, when our brother sets a stumblingblock before us, when we lose friends, and even suffer personal or physical attacks on us-- it certainly brings us down. Nonetheless, through faith, God picks us up in the midst of our many trials and afflictions. He sustains us and draws us closer to him, and our trials work patience in our life-- and they teach us not to react in our own strength but to respond to every circumstance commensurate with God's will. Oh, how many mistakes we make along the way. God identifies with our weaknesses since he was tempted and tried in all points as we are...
If one can grasp anything from the Psalter-- it's not to let our emotions control us, but we can control our emotions by recognizing that we have a sovereign God in charge... he is our parakletos, our advocate and helper... we don't have to be a victim of our circumstances, but we can overcome them and endure them through faith.
HELP!! is an adequate summation of the Psalter.