experience
Experience is a school
“Experience is a school where a man learns what a big fool he has been.” ~ Josh Billings
Knowledge gained through experience
“Knowledge gained through experience is far superior and many times more useful than bookish knowledge.” ~ Mahatma Gandhi
One thorn of experience
“One thorn of experience is worth a whole wilderness of warning.” ~ James Russell Lowell
Methods to gaining wisdom
“There are three methods to gaining wisdom. The first is reflection, which is the highest. The second is limitation, which is the easiest. The third is experience, which is the bitterest.” ~ Confucius