Those who do not remember the past are condemned to repeat it.
—George Santayana (by Samuel Johnson Woolf; Public Domain)
…And this is not limited to your past. No matter the endeavor you wish to undertake, research the history of others who have taken a similar path. Learn about their mistakes made, their failures, their successes. Immerse yourself in the process and uncover the clear path forward. This process will give you incredible leverage in life and help you achieve your objectives as efficiently as possible.
—MSH, Penn Wealth