Wilhelm Johannsen

"Genetics is the science of heredity, and heredity is the fundamental principle of life."

"The gene is the unit of heredity, but it is not the unit of evolution."

"Nature does nothing suddenly, and gradualism is the law of change."

"Pure lines are the foundation of scientific breeding."

"Selection is the art of choosing what nature offers."

"The organism is not the sum of its genes, but their expression."

"Variation is the raw material of evolution."

"Knowledge of heredity is knowledge of ourselves."

"The study of genetics reveals the unity of all life."

"Heredity is not destiny, but predisposition."

"Every organism carries the history of life within it."

"The gene is eternal, the organism is temporary."

"Science seeks truth through observation and experiment."

"Nature is the greatest teacher of all."

"Understand heredity, understand yourself."

"The laws of nature are the laws of life."

"Change comes through generations, not moments."

"Pure science is the pursuit of truth for its own sake."

"Evolution is the story written in our genes."

"The organism develops according to its nature and nurture."

"Patience with nature reveals her secrets."

"Life is the expression of hereditary factors."

"Research requires dedication and perseverance."

"The phenotype is the expression of the genotype and environment."

"To understand life, study inheritance."

"Nature works through principles, not accidents."

"Heredity and environment are partners in creation."

"The scientist must be humble before nature."

"Truth is discovered, not invented."

"Every organism is a unique expression of eternal principles."