Best Quotes on Challenge

As iron sharpens iron, so a friend sharpens a friend.

All marriages are happy. It's the living together afterward that causes all the trouble.

When I'm weak, you can be strong; when I'm strong, you can be weak. That's what I believe marriage is.

Man needs difficulties in life because they are necessary to enjoy the success.

Science and technology are essential for development. We must invest in research and development to create new technologies that can help us solve the challenges we face.