What are the main reasons for Christ speaking in parables?

The usage of parables by Christ serves a dual purpose: it reveals truths about the kingdom of God to those who are spiritually receptive while concealing these truths from those who are not. In Luke 8:10, Jesus explains that to the disciples, the mysteries of the kingdom are given, but to others, they are spoken in parables so that they may not understand. This method illustrates God's sovereignty in choosing whom to illuminate with His truth, demonstrating that true understanding requires divine revelation. It aligns with the Reformed understanding that the Gospel is not universally understood or accepted and emphasizes the necessity of the Holy Spirit's work for comprehension of spiritual truths.