Mikhail Botvinnik on what it takes to be good chess player

• Natural chess talent (This is logical, right?)
• Strong character. Depression is bad for life in general, chess is not excluded.
• Persistence, stubbornness. No draw backs allowed. You have to have strong belief in your cause and keep pushing forward.
• Special preparations. Good endgame knowledge, opening systems worked out and constant middlegame practice.
• Stable - Do i have to elaborate this?