给我五个谚语。
1. 古之学者必有师。 "Every wise person has a teacher."
2. 人生自古谁无死，留取丹心照汗青。 "Since ancient times, no one can escape death, so leave behind a good reputation."
3. 三思而后行。 "Think thrice before taking action."
4. 有志者，事竟成。 "Where there's a will, there's a way."
5. 金无足赤，人无完人。 "Neither gold nor people are perfect."