First of all, this verse tells us about God's goodness, and this is perhaps the main thing. If God is good, then in the world He created there is a possibility for happiness, and this happiness is reached, more than happiness, blessedness, by trust in Him, by hope in Him. And it also says here that God's goodness is not an abstraction, but something known in real experience. The verbs describing this experience are remarkable: taste, because the experience of communion with God is always inward and one must let the Lord inside oneself for it, and notice the parallel passages, remember the Last Supper; see, because this is an experience of contemplation, and God is light and there is no darkness in Him at all.