For the third peaceful practice the Buddha cautions us to not harbor ill thoughts nor point out the faults of others just because they practice some other way; we should embrace them with compassion. In this practice the key is what is in our minds really is reflected in our environment, and our speech reflects and mirrors this as well. While it may be possible to use flattery, to do so is not necessarily Buddhist practice. To enter into the realm of comparisons and finding fault is a quick entry into the realm of animals, if our heart is not pure and doesn’t remain so. It is easy to criticize but it is difficult to do so and be a noble guide to the truth. You only need to think of the boss or parent who is never satisfied as if they are the only ones capable of doing some thing correctly.
Lecture on the Lotus Sutra