"Such fire was not by water to be drowned, nor he his nature changed by changing ground"

Ludovico Ariosto, an eminent Italian poet of the Renaissance age, is celebrated for his epic poem "Orlando Furioso". The text from the quote, "Such fire was not by water to be drowned, nor he his nature changed by changing ground", reflects themes of inner passion, resilience, and the immutable nature of one's character.

The "fire" pointed out in the quote signifies a powerful driving force, potentially enthusiasm, love, ambition, or an indomitable spirit, which is inherent in an individual or circumstance. It highlights an impassioned energy that is so extreme and robust that it can not be snuffed out or controlled by "water". Water, in this context, represents contrary forces or obstacles that generally have the capability to diminish or put out fire. The assertion is that some internal fires burn so vibrantly and strongly that external obstacles, regardless of their intensity, can not quench them.

The second part of the quote, "nor he his nature changed by changing ground", suggests a steadfastness in character and identity. This suggests that despite modifications in environment or situations-- the "altering ground"-- a person's essential nature remains the same. This can be translated as a commentary on human constancy and authenticity. No matter how situations around an individual change, or how much pressure they face to adjust or conform, the core essence of who they are persists.

Together, these lines from Ariosto recommend a message of determination and credibility. The essence has to do with holding onto one's intrinsic qualities and passions regardless of external pressures or modifications. This resonates deeply with anybody who has actually dealt with challenges that evaluated their core beliefs or identity. It functions as an enduring reminder of resilience and the power of staying true to oneself. Ariosto eloquently records the ageless battle of maintaining one's spirit in the face of adversity, a theme as pertinent today as it remained in the Renaissance.