deeper - 10:17 am on Aug 26, 2013 (gmt 0)
It is natural to have pages focused on a certain topic and therefore using just one or two KWs. Let us say, a page is clearly focused on blue widgets.
Therefore it would be natural to link internally with "blue widgets". It is the correct content of the linked page, it is descriptive, it is good for the user. So how can it be a reason for problems?
Indyrank gave the link where Matt Cutts very clearly explained that internal linking with KWs usually is no problem. He even stressed why doing it is a good idea. Why nobody here wants to believe? MC usually does not say all or is vague, but he is not a conscious liar.