How do we know that God gives understanding to His people?

Throughout Scripture, we see that understanding is a gift from God. Acts 28:26-27 references Isaiah's prophecy regarding those who hear but do not understand, showing a divine judicial act. Meanwhile, Jesus openly teaches His disciples, stating that He'll open their understanding. Similarly, Hebrews 11 emphasizes that faith is how we comprehend spiritual realities. Moreover, God promises that all His people will one day understand Him fully and will know Him personally, fulfilling Jeremiah 31:34.