老当益壮,宁移白首之心;穷且益坚,不坠青云之志。
In old age one should grow still stronger—how could a white-haired heart be changed? In hardship one should grow still firmer and never let high aspiration fall.
Plain meaningNeither age nor hardship should make you abandon a worthy ambition.
Original context and translation note
English wording on Gu Ren Said is an original reading aid, not a claim that there is only one valid literary translation.