Why are visions and dreams often symbolic?

Why are visions and dreams often symbolic? This thing is a grace and mercy from God. If the dream unfolds to everyone, and it comes in a clear and direct way, especially the one who is terrified of it, then the life of a person will become hell, and everyone will be preoccupied with what he saw in sleep, and this requires the strength of faith and certainty that may not be available to the average person, and therefore the messengers, peace and blessings be upon them, only see Indeed, most of their visions are of the type of sincere visions, which occur as they were seen, and therefore it has been proven that the most severe people are the scourge of the prophets, and then those who color them.