And he that saw it bore record, and his record is true: and he knows that he said true, that you might believe.
The truth we receive from another may either derive its authority from the teacher, or reflect on him the authority it contains. As the receiver of money may argue, either that money is good because it is an honest man who pays it, or that the man is honest because he pays good money, so in the communication of truth, it may be a valid inference, either that the doctrine is true because it is a trustworthy man who teaches it, or that the man who teaches it is a veracious and trustworthy because his doctrine is true.
(J. Caird, D. D.)
Parallel VersesKJV: And he that saw it bare record, and his record is true: and he knoweth that he saith true, that ye might believe.