Convince yourself that worrying about many situations will make them worse rather than improve them.

For that again, is what all manner of religion essentially is: childish dependency. If something is irrational, that means it won't work. It's usually unrealistic. People don't just get upset. They contribute to their upsetness. People have motives and thoughts of which they are unaware. Rational beliefs bring us closer to getting good results in the real world. Self-esteem is the greatest sickness known to man or woman because it's conditional. The art of love is largely the art of persistence.

If something is irrational, that means it won't work. It's usually unrealistic.

People could rationally decide that prolonged relationships take up too much time and effort and that they'd much rather do other kinds of things. But most people are afraid of rejection.

If you would stop, really stop, damning yourself, others, and unkind conditions, you would find it almost impossible to upset yourself emotionally - about anything. Yes, anything.

If the Martians ever find out how human beings think, they'll kill themselves laughing.

Humans can always accept themselves unconditionally.