"Think logically" is a common phrase used to encourage critical thinking and reasoning. However, there are several synonyms that can be used to convey a similar message. One such alternative is "reason analytically," which emphasizes the importance of breaking down complex information into smaller parts and evaluating them logically. "Exercise rationality" is another similar phrase that suggests using logical and sensible thoughts to arrive at conclusions. "Engage in coherent thinking" highlights the importance of clear and understandable ideas. Overall, these synonyms emphasize the importance of approaching problems and situations with a logical and analytical mindset.