The 1907 LDS vest-pocket edition introduced the past-tense manifested in place of the presenttense manifesteth. Either tense will work here, although it appears that Jacob is speaking in the eternal present tense; note the use of the present-tense is earlier in this verse (“the power of the resurrection which is in Christ”). Thus the use of the present-tense manifesteth is acceptable, although unexpected. The 1907 past-tense reading has never been followed by any subsequent LDS edition since that vest-pocket edition was never used as a copy-text.
Summary: Retain in Jacob 4:11 the present-tense manifesteth, the reading of the earliest textual sources.