Society condemns self-love. It says it is selfishness, it says it is narcissistic. Yes, self-love can become narcissistic but it is not necessarily so. It can become narcissistic if it never moves beyond itself, it can become a kind of selfishness if it becomes confined to yourself. Otherwise, self-love is the beginning of all other loves.
A person who loves himself sooner or later starts overflowing with love. A person who trusts himself cannot distrust anybody, even those who are going to deceive him, even those who have already deceived him. Yes, he cannot even distrust them, because now he knows trust is far more valuable than anything else.
You can cheat a person -- but in what can you cheat him? You can take some money or something else from him. But the man who knows the beauty of trust will not be distracted by these small things. He will still love you, he will still trust you. And then a miracle happens: if a man really trusts you, it is impossible to cheat him, almost impossible.