An investor, on the other hand, knows that nobody can predict the future. Those who seem to are merely lucky. An investor is somebody who buys an investment as defined by this definition, written by Benjamin Graham: “An investment is something which, upon thorough analysis, promises both safety of principle and an adequate rate of return. Anything else is speculation.” So, we must be sure that safety is virtually guaranteed along with our profit. We must make sure of this based on facts, not on opinions or what we think might happen. We must be sure of it, and it must be based on solid logic.