唯一
To be what we are, and to become what we are capable of becoming, is the only end of life.
Love is the only way to grasp another human being in the innermost core of his personality.
The only person who cannot be helped is that individual who blames others.
The only way to understand another culture is to assume the frame of reference of that culture.
The only way to change behavior is through manipulation of reinforcement contingencies.
The only meaningful way to study learning is through objective measurement.
The only valid data for psychology are observable behaviors.
The only difference between a rat and a human is that a rat learns from experience.
The only thing that you can control is your effort and your attitude.
The only limits that exist are the ones in your mind.
The only way to overcome fear is to face it.
The only limits that exist are the ones in your mind.
The only person you should try to be better than is the person you were yesterday.
The only limits that exist are the ones you place on yourself.
The only way to achieve the impossible is to believe it is possible.
The only limits that exist are the ones in your mind.
The only way to overcome obstacles is to face them head-on.