1 - Ep. 130, 4.

2 - Cf. Confess. 4, 4, 7-7, 12.

3 - Cf. Contra Acad. 2, 2, 3-6.

4 - Confess. 9, 4, 7; cf. 6, 7, 11.

5 - Confess. 9, 3, 6; cf. 4, 3, 6.

6 - Confess. 6, 10, 17.

7 - Cf. Epp. 159; 162; 164; 169.

8 - Cf. Epp. 84, 1; 63, 10.

9 - Cf. Ep. 38.

10 - Cf. Epp. 28; 40; 67; 71; 73; 82; 166; 167.

11 - Cf. Epp. 27; 31; 42; 45; 45; 80; 95; 149; 186.

12 - Cf. Ep. 37.

13 - Ep. 82, 36; cf. 82, 12. 32.

14 - Cf. Contra Acad. 3, 6, 13; Ep. 258, 1.

15 - Ep. 155, 1.

16 - Solil. 1, 12, 20-13, 22.

17 - Ep. 110, 2-4.

18 - Ep. 58, 1-2.

19 - Cf. Epp. 9, 1; 10, 1; 27, 1; 31, 4; 73, 5.

20 - Ep. 84, 1.

21 - Ep. 73, 10.

22 - Ep. 258, 4.

23 - Cf. Ep. 118.

24 - Ep. 216, 1.

25 - Ep. 224, 2.