Matthew Henry says: "We are taught where the true cause of evil lies, and where the blame aught to be laid...in other Scriptures, the Devil is called the tempter, and other things may sometimes occur to tempt us; but neither the Devil nor any other person is to be blamed so as to excuse ourselves, for the true origin of evil and temptation is in our own hearts. The combustible matter is in us, though the flame may be blown up by some outward causes."
Recommended reading:
A Quest for Godliness - The Puritan Vision of the Christian Life, by J. I. Packer