If you gain power through knowledge and understanding, you will not be easily corrupted by power.But if you gain power through force or violence or subterfuge (fraud, deception, etc.), then power will corrupt you. In other words, to keep power, you will be ready to do anything.In fact, this is what happened to Anakin Skywalker. He was "given" power by Palpatine. So he did everything he could to keep it (he even wanted to recruit Luke, his son, to get rid of the Emperor).Obi-Wan, on the other hand, became powerful through understanding and meditation. His supreme power was demonstrated when, in his last battle with his former apprentice, he just closed his eyes and disappeared into the next world (if that's not power, I don't know what is!).Obi-Wan gained power through knowledge and understanding. It is the only correct path to power.