A lot of people are afraid to tell the truth to say no. That's where toughness comes into play. Toughness is not being a bully. It's having backbone.

Tennis is all about mental toughness and you have to keep your head in the game. I make time to relax away from competition pressures travel and intense training schedules to make sure I'm looking after myself. Taking time out with family and friends helps to maintain the work-life balance everyone needs.

Anyone who has a continuous smile on his face conceals a toughness that is almost frightening.

My biggest problem will be lack of match toughness but I am a positive optimistic person.

Brave men are all vertebrates they have their softness on the surface and their toughness in the middle.

I believe this with all my heart: The greatest coach of all time in my eyes is my mom. She's instilled in me a toughness and a perseverance and just a never-quit mentality and I thank her every day for providing me for what she sacrificed her life for.

Despite our very recent appearance on the planet humanity combines arrogance with increasing material demands even as we become more numerous. Our toughness is a delusion. Have we the intelligence and discipline to vigilantly guard against our tendency to grow without limit?

I'm not a fighter but I would love to be a boxer because I love the courage and toughness. I mean there can be nothing more terrifying than walking into an arena and looking at Mike Tyson in the ring.

I with a deeper instinct choose a man who compels my strength who makes enormous demands on me who does not doubt my courage or my toughness who does not believe me naive or innocent who has the courage to treat me like a woman.

In the end I didn't get a top car any more. I had no toughness left. That was the reality.