Additional problems could be presented to street corner orators from rival political groups or hecklers. A skilled and effective "soapboxer" had to be quick on his feet, figuratively and sometimes literally, having the ability to express political opinions with clarity, to have ready answers for common objections, to be able to deflect hostility with humor or satire, and to be able to face difficulty or danger with fortitude. Soapboxing proved to be what one historian has called "a hard, but nevertheless necessary, process in the development of revolutionary leaders."