Which of the following statements is not true about oral evidence?

As per Illustration s. 60 of the Indian Evidence Act, 1872. S. 60. Oral evidence must be direct. –– Oral evidence must, in all cases, whatever, be direct; that is to say –– if it refers to a fact which could be seen, it must be the evidence of a witness who says he saw it; if it refers to a fact which could be heard, it must be the evidence of a witness who says he heard it; if it refers to a fact which could be perceived by any other sense or in any other manner, it must  be the evidence of a witness who says he perceived it by that sense or in that manner; if it refers to an opinion or to the grounds on which that opinion is held, it must be the evidence of  the person who holds that opinion on those grounds: