Some people have this awareness that within them is a piece of the Divine. Others have no idea. Nobody has ever told them to look within. If the person did look within and was confused, perplexed, bored, frightened, they stopped. They didn't stick with it. To pursue the truth of the Divine within takes courage, persistence, and faith.
It helps to have someone further along the path of the spirit to encourage others to come along. Most people will not listen because they don't believe the encourager has anything of value to impart. Jesus says in Matthew 13:4-9: