Therefore, not only was Channing a pioneer in American religion with his liberal doctrine, but he was also an intelligent man with respected, religious based critique of war and slavery. His impact can be seen in the growing acceptance of liberal religion in America. Some of his liberal interpretations, mainly a rational rather than emotional approach to faith, are slowly being admitted by traditional, conservative churches. Channing's impact is felt equally in American religion and academic circles; he clearly affected such great thinkers as his contemporary Ralph Waldo Emerson and Henry David Thoreau. Complex and extraordinary men like Channing aren't appreciated in their lifetime. Even now his influence may be underestimated, but it is clear Channing's mind was sharp and produced ideas well ahead of his time that continue to impact the great thinkers of today.