Sublimity hasn't ever been realized by anyone. Perhaps mankind has a lot more to evolve. The final product of evolution could be the realization of the divine in us. So the motto suggests that we take the right step towards this ideal.
It is to remind us that the process of moulding must be right. Quality education is the only answer. Pupils should learn to contemplate, strive towards that divine light — which may be faraway, but surely in the direction they are walking.