Двете най-леки за изговаряне думи "да" и "не" изискват най-много размишление.

“It is difficult to walk at one and the same time many paths of life.”

“Reason is immortal, all else mortal.”

“If there be light, then there is darkness; if cold, heat; if height, depth; if …”

“Choose always the way that seems the best, however rough it may be; custom will…”