"Anyone who does things carelessly also learns to talk carelessly. But careless, unclear, inexact talk drags into its carelessness and unclarity an idea. My very dear, dear children: don't let yourselves think carelessly. An idea is God's gift and it needs to be taken care of. To be clear in one's ideas, and to be responsible for them, is a token of spiritual freedom and intellectual joy."
From Florensky, Pavel. "My Will." Quoted in Florensky, Iconostasis.