The reason for this decision is difficult to understand.

I acted advisedly before making an important decision.

There is no valid reason to behave that way.

I can't reason with you when you're angry.

The reasons for his behavior are still unknown.

I have no reasons to doubt you.

You acted rightly in making that decision.

Reasoning is the process of logical thinking.

She reasoned well on the matter.

You were thinking too much about that problem.