Are you wise enough to know the meaning of the last three lines?

Wisdom
by Barbara Lynn Terry

Wisdom is what we have

when we think before we say

things that make no sense.

Wisdom is the truth that

clears our difficult path

so we can see clearly.

Wisdom are the words of the sage,

spoken without rage

for those who wish to learn.

But wise is the one who speaks

only when they have the intelligence

to remain silent.

Barbara Lynn Terry

http://www.poemhunter.com/poem/wisdom-36/