Eli, knowing his son's sins & failed to restrain them, is soft hearted to his sons yet not blinded by their wrongdoings. He knows that God is God, He will judge and His word will come through. Samuel, simply a boy but as he received God's word, Eli (being His teacher or discipler) is humble to receive the word from Samuel as He knows the word comes from the Lord. Maturity and hearing from God do not depend on ages or status, they are a result of keeping ourselves right before God & close to God.