The famous sayings about doubt are as follows:

1. Doubt is the beginning of wisdom, doubt is investigation, doubt is knocking on the door, doubt is the key to search, so doubt is a good method. ——Dreyfus.

2. Doubt is like a poisonous fruit on a tree. Only the sword of truth can cut it off. ——Shakespeare.

3. Doubting everything is not glorious, but not having doubts is dishonorable. ——Tennyson.

4. Don’t let your suspicion scare away your friends, because suspicion is the poison of friendship. ——Thomas Brown.

5. Doubt is the key to knowledge, it can help us open the door to the unknown. ——Carl Jung.

6. Doubt everything, but don’t doubt your own wisdom. ——Oscar Wilde.

7. Our doubts are the price we pay for the truth. ——Blaise Pascal.

8. Don’t let your doubts block your eyes, because every doubt may miss the truth. ——Russell Brown.

9. The greatest doubt is the greatest misunderstanding of the facts. ——Albert Einstein.

10. Doubt is a disease, and only truth is the cure. ——Louis Pasteur.

11. Without doubt, there is no understanding, and without understanding, there is no action. ——Thomas Stratford.

12. Let us never forget our doubts, because only through fiery doubts can we move towards the truth. ——Karl Marx.

13. The biggest difficulty is that we always doubt things we cannot understand. ——Arthur C. Clarke.

14. Doubt is the night barrier of knowledge. Only by removing it can we see the dawn of truth. ——Carl Baker.

15. Don’t question the rights and wrongs of your own actions, because a firm action itself already contains infinite meaning. ——Kafka.

16. Don’t give up on your decision because of your doubts, because every decision may be a growth for you. ——Robert Frost.

17. Faith without doubt is not true faith. ——Carl Jung.

18. Our doubts are the biggest obstacle to the progress of our knowledge. ——J.K. Rowling.

19. Doubt is a bridge to understanding, not a barrier to isolation. ——Carl Jung.

20. Life without testing is meaningless; life without doubt is empty. ——Tolstoy.