If you have peace of mind, ...

If you have peace of mind, when you meet with problems and difficulties they won’t disturb your inner peace. You’ll be able to employ your human intelligence more effectively. But, if your mental state is disturbed, full of emotion, it is very difficult to cope with problems, because the mind that is full of emotion is biased, unable to see reality. So whatever you do will be unrealistic and naturally fail.
If you have peace of mind, when you meet with problems and difficulties they won’t disturb your inner peace. You’ll be able to employ your human intelligence more effectively. But, if your mental state is disturbed, full of emotion, it is very difficult to cope with problems, because the mind that is full of emotion is biased, unable to see reality. So whatever you do will be unrealistic and naturally fail.

Quotes from the same author

Material objects give rise to physical happiness, while spiritual development gives rise to mental happiness. Since we experience both physical and mental happiness, we need both material and spiritual development. This is why, for our own good and that of society we need to balance material progress with inner development.
With the realization of one's own potential and self-confidence in one's ability, one can build a better world.
It is difficult to achieve a spirit of genuine cooperation as long as people remain indifferent to the feelings and happiness of others.
There is no need for temples, no need for complicated philosophies. My brain and my heart are my temples; my philosophy is kindness.
I believe that we are fundamentally the same and have the same basic potential.