When I was 15 I worked at a dry cleaner because I wanted Abercrombie & Fitch jeans. My mom told me I could have $20 jeans not $70 jeans unless I was willing to work for them. So I did!
Ignorance more frequently begets confidence than does knowledge: it is those who know little, not those who know much, who so positively assert that this or that problem will never be solved by science.