What makes a person a good investor is the ability to take calculated risk and also know when to pull out ones investment. Emotions must be mastered so much that it plays little or no role in an investor making decisions (financing or investment) decisions as the case may be. Even in the case of a loss, an investor must take appraisal of the process and find out where he/she got it wrong. This is will minimise a repetition of the same mistake in the future.
ya I always see quotes from successful investors, that we must dare to take risks, and more importantly from a good investor is to continue to learn and explore information about what will be learned. so it's very good when you have a lot of knowledge. One of the most important things is to manage mentally, a good investor must have discipline and good emotions.