- Live long and prosper.
- Leonard Nimoy, Amok Time, (1967)
- Said on many occasions, normally accompanied by salute. Standard reply:
- Nothing that is is unimportant.
- Challenge your preconceptions, or they will challenge you.
- Star Trek: Enterprise, Season 1 Episode 4, Strange New World
- Infinite diversity in infinite combination.
- My mind to your mind... my thoughts to your thoughts...
- Logic is the cement of our civilization, with which we ascend from chaos, using reason as our guide.
- T'Plana-Hath, Matron of Vulcan Philosophy
- We are here to serve.
- The needs of the many outweigh the needs of the few or the one.
- Logic is the beginning, not the end, of Wisdom.
- What is, is. (Kaiidth)