Buffet and his fellow Charlie Munger does not invest in businesses they don`t understand. For him to invest in IBM 10 Billion dollars, took 50 years.
Do you realise that that afirmation can not be true? Based on the fact that he can not know everithing about even one of his investments.
Do you realise that something that a person says and reality are two complete different things?
Does not matter it it is Buffet, me, or you.
Natural language is very limited, and not only that, sometimes it is not used in the best possible way.
Therefore it can not be taken literaly.
What Buffet means is that he sees himself as an investor that tends to invest only on something that he is a little bit more sure than most investors.
And that is only what he thinks about himself based on his distorted view of reality (distorted like anyone else).
Warren Buffer or not, people say bulshit most of the times when they state those geral principles about something (even themselves), like "It always happens this way.." or "I neved to this..., or "I do that in those situations... blahblah". Even if they are not aware of it.