"The Earth's Creation is the glory of God, as seen from the works of Nature by Man alone."

"I am not ashamed to confess that I have learned much from women."

"The natural system will always remain the greatest goal for botanists."

"¿Qué tiene de extraño que yo no vea a Dios si no puedo ver siquiera al Yo que vive en mí?"

"The true botanist is not one who knows many plants, but one who knows how to find them."