A bit over 10 years ago I when to my first mediation retreat, Vipassan was the technique. Some dude named Buddha came up with it. This, out of all the personal development tools I have ever learnt has been the most practical and applicable in my life.
"A gem cannot be polished without friction, nor a man (person) perfected without trials." Seneca
"He (they) who fears death will never do anything worthy of a man (person) who is alive." Seneca
"First say to yourself what you would be; and then do what you have to do." Epictetus