The root of sin

Hudson Taylor on the nature of sin:

"Sins committed appeared but as trifles compared with the sin of unbelief which was their cause, which could not or would not take God at His word, but rather made Him a liar! Unbelief was, I felt, the damning sin of the world – yet I indulged in it."

Biography of James Hudson Taylor, 1973 edition, p306-7