Real strength is not in pretending emotions don't exist, but in controlling and domesticating them. John Glenn's ability to keep his heart rate under 100 beats per minute during a nearly day-long orbit exemplifies the power of emotional equanimity.
NASA astronauts go through a graded series of exposures to prepare for their trip into space, while John Glenn’s heart rate stays under 100 bpm for nearly a day during his orbit around the Earth.
The absence of extreme emotions in men leads to emotional equanimity, allowing them to properly cultivate the "right stuff," according to Tom Wolfe. This involves the loss of harmful and unhelpful feelings while maintaining a healthy emotional balance.
The strength lies in controlling your emotions, not denying them - this is the way to avoid unhelpful and destructive emotions. It is important to focus on introspection, alertness, and wisdom instead of worry.