1, you should observe carefully to understand; We should try to understand in order to take action. -romain rolland

If you want to see the truth, pay close attention to it anywhere. -Fan Song

3. The detail lies in observation, and success lies in accumulation. Emerson

4. Observe, observe and observe again. -Pavlov

Careful observation of small things is the secret of success in career, art, science and life. -Smyer

6. All reasoning must come from observation and experiment. Galileo