Hebrews 11:1 is one of the most important definitions of faith given in the NT. Is this translation of the NWT adequate or does it add points that are not to be found in the Greek original:
Faith is the assured expectation of what is hoped for, the evident demonstration (footnote: Or "convincing evidence") of realities that are not seen.
Here is the entry in BDAG:
ἔλεγχος, ου, ὁ (Pind., Pre-Socr. et al.; pap, LXX; PsSol tit. [no. 9]; TestJos 6:6; Philo [s. CBarrett, JTS n.s. 1, ’50, 9], Joseph., Just., Tat., Ath.) ① the act of presenting evidence for the truth of someth., proof, proving (Pla., Gorg. 471e; Demosth. 44, 15 τὸ πρᾶγμα τὸν ἔλεγχον δώσει; Epict. 3, 10, 11; POxy 237 VIII, 17; PStras 41, 6 ὁ ἔλ. δεικνύσει; Job 23:7, cp. vs. 4; Philo, Praem. 4 ἔ. τ. ἀληθείας; Jos., Bell. 1, 626; 628, C. Ap. 2, 17) ἔ. πραγμάτων οὐ βλεπομένων faith is a proving (or conviction about) unseen things=faith means to be sure about things unseen (in contrast to confidence in the temporal) Hb 11:1. ② the act of charging a pers. with wrongdoing, accusation σύ μου ἔ. εἶ; will you accuse me? Hv 1, 1, 6 (other interpretations: complaint [Hab 2:1]: will you lodge a complaint against me?; conviction [BGU 1138, 13=Mitt-Wilck. II/2, 100, 13 (19/18 B.C.)]; Kaibel 814 of a monument that serves as a touchstone to identify either those well-disposed toward the dead or the impious; cp. TestJos 6:6). ③ expression of strong disapproval, reproof, censure, correction (Job 6:26; 13:6; Wsd 2:14; Philo, Rer. Div. Her. 76) 1 Cl 57:4f (Pr 1:25, 30); 2 Ti 3:16 v.l.—DELG s.v. ἐλέγχω. M-M. TW
Arndt, W., Danker, F. W., Bauer, W., & Gingrich, F. W. (2000). A Greek-English lexicon of the New Testament and other early Christian literature (3rd ed., p. 315). Chicago: University of Chicago Press.
Here is the Greek:
Westcott and Hort / [NA27 variants]
Ἔστιν δὲ πίστις ἐλπιζομένων ὑπόστασις, πραγμάτων ἔλεγχος οὐ βλεπομένων·
Specifically, is "evident demonstration" (or "convincing evidence") an acceptable translation of ἔλεγχος? Other translations have "conviction" (e.g., ESV, NASB).