Avoid spamming your content with keywords.If you do it your are losing chance in getting noticed by search engines.Maintaining the balance of your keywords is known as KEYWORD DENSITY.
It is important for site owners or bloggers.Search engines use this KEYWORD DENSITY in order to determine the relevancy of your site.That menas which terms your site is relevant to.It is important to maintain a perfect keyword density to achieve a higher search rank position.There must be a proper balance.If it is too low you are not getting the optimum benefit,if it is too high your page might get flagged for keyword spamming.
There are vast resources online to check your keyword density.The software will show you exactly how many times a word or sentence have been repeated and suggests you to modify.
So maintaining a proper balance of your keywords is also an important factor to get ranking.