Russia knows of the vulnerability of her frontiers in this part of the world.

- Aly Khan

Liberty has restraints but no frontiers.

- David Lloyd George

I don't believe in frontiers, and I don't believe in races or nationalities.

- Julio Iglesias

The frontiers we broke into in the '60s are still largely unexplored.

- Ken Kesey

It's not a good idea to always look for new frontiers, especially when you have opportunities in your existing businesses, in your own backyard.

- Kumar Mangalam Birla

Poetry is like a bird, it ignores all frontiers.

- Yevgeny Yevtushenko