Never be obtuse. It is a sign that you do not have a Love Of The Truth. It is a recipe for deception.
Jesus is the Truth. This means that He hides nothing but reveals all Truth. For us to be His brothers we must abide in a Love Of The Truth.
When you encounter a person who resists the Truth, ask them a revealing question and then walk away.
Only when they want the Truth will it be revealed to them.
Examples of obtuse people:
→ the children of Israel who chose Baal
→ the Pharoah of the Exodus
→ Scribes Pharisees And Hypocrites of Jesus' day
→ Jews who resisted Paul's teaching in their synagogues
→ Atheists, agnostics and people of other religions who have heard the Gospel and rejected it.