At that time, many heroes expressed that at a certain moment or era, many outstanding and heroic figures appeared. Heroes here refer to people with outstanding talents, courage and determination.
Ruthlessness may not be a real hero, but it is a deep thinking about heroes. The meaning of this sentence is that those seemingly heartless people are not necessarily real heroes or heroes. Being cold here does not mean being cold in character, but being able to remain calm and not be influenced by emotions when facing difficulties or challenges. A real hero is a real hero or a successful person. This sentence implies that success depends not on superficial emotional expression, but on one's inner quality and ability to cope with difficulties. The ideas in these poems are all related to praising, respecting or encouraging people. By praising those who have excellent qualities and talents, people can be inspired to make progress.