Despite appearances, our thoughts are the source of our unhappiness. When we do not immerse ourselves in false states of mind (wicked), we are happy. Thoughts based in sensual or worldly perception, give us feedback that is erroneous (sin). When we are distracted by the external, we miss the mark. If we stay single-mindedly focused on God (on his law they meditate day and night), we find joy. Choosing the presence of God is not a part-time activity. We must choose the Divine both day and night. Christ within reveals the path to us. When we follow that guidance, we can participate in the joy of God.
The happy are like trees, planted by streams of water. In this context water represents life or vital energy. Trees do not need to search for water; they are set in a place that has everything they need to grow. We do not need to search for happiness outside of ourselves. We are planted in the presence of our Source. When we are still, bask in the presence of God, and just allow Spirit to do its work; we fulfill our spiritual, mental and physical potential (yield their fruit in its season). In all things we will be prosperous. We need only to tap into that source of life, through regular spiritual practice.
Eventually, as long as we do not hold on to them tightly our faulty beliefs and thoughts will blow away like chaff in the wind. Error thinking (wicked, sinners) cannot result in discernment (judgment) nor can it bring us into a right relationship with God (righteousness). The only path is to happiness is in God's way, the way of wisdom.
And so it is! Amen!