Charles G. Finney
three great sources of temptation

"The Bible mentions three great sources of temptation--the world, the flesh and Satan. The outward world is so correlated to our susceptibilities as to excite them and thus beget a temptation to self-indulgence. The flesh with its appetites and passions clamor for gratification; and hence the flesh and the outward world become temptations. Satan also presents his temptations in every form which subtle malignity can devise."