Heidegger's Bible Handbook: 2 Timothy: Synoptic Outline
The parts:
I. An admonition concerning stirring up the gift, patience, holding fast the form of doctrine; and praise of Onesiphorus, chapter 1.
II. An exhortation to fortitude, the passing on of pure doctrine to others, patience, and purity of life, chapter 2.

III. A prophecy concerning men of the last time, the persecution of the good, the success of the evil; and an admonition to constancy in the faith of the Word of God, chapter 3.
IV. An exhortation to faithful and constant preaching; an invitation to Timothy, and greetings, chapter 4.