When I myself had twice or thrice made a resolute resistance unto anger, the like befell me that did the Thebans; who, having once foiled the Lacedaemonians (who before that time had held themselves invincible), never after lost so much as one battle which they fought against them.
PlutarchNature without learning is like a blind man; learning without Nature, like a maimed one; practice without both, incomplete. As in agriculture a good soil is first sought for, then a skilful husbandman, and then good seed; in the same way nature corresponds to the soil, the teacher to the husbandman, precepts and instruction to the seed.
Plutarch