You can't keep a good man/woman down spoken language informal
A person who is determined and competent will be able to overcome difficulties or challenges and will be successful eventually.
A: "I think it's time to give up." B: "No. You can't keep a good man down!"
Try to interfere with his work and he'll come back stronger. You know you can't keep a good man down.
Small and steady efforts can bring about big results.
Someone who has a strong personality
Persistence and determination will achieve success.
A person whose character is strong and determined, and is not easily influenced by other people
To do whatever it takes to achieve something, whether ending in success or failure
This phrase is often linked to passages in both the Old and New Testaments, including the obvious connection to the Resurrection.
It's also the title of the song Can't Keep A Good Man Down by John Miles & Robert Marshall.