God feeds us a little at a time. When we have digested and assimilated that knowledge, then He feeds us another bite. This is a divine process which applies to all the laws of life. When we were children, we began our schooling by going to kindergarten, and from there, step by step through each grade, our knowledge grew until we were ready to attend a university. In nature we first have to plant the seed, then we have to give it time to grow and bear fruit, and only after that can we reap the harvest.
Prejudices are great barriers to our personal progress.
By there very nature, a prejudice attitude is one that is static and fixed rather dynamic and growing. Like thick clouds, they block out the rays of the light of truth. Truth is meant to be learned one step at a time, and each revealed truth is built upon the previously learned truths. When we set up barriers of prejudice, we stop the building process. Therefore, our knowledge of truth ceases to grow.