<p>The <strong>most common </strong>factors that influence one's behaviour are:</p>
<ul>
  <li>The <strong>Environment</strong> he was raised in&nbsp;</li>
</ul>
<p>A good example for this would be one who was spoiled by his/her parents while growing up. Giving in to ALL his/her wants. A child raised this way will <em>likely</em> end up being too "self-centered" as he is used to all the attention. Compare that to one who comes from a poor family and has to struggle in an early age just to survive. That child will likely end up as a "hardworking" adult as it is now imprinted in his thoughts that one needs to work very hard in order to survive in this cruel world.</p>
<ul>
  <li>The <strong>Personality </strong>of the people raising him/her&nbsp;</li>
</ul>
<p>One factor that needs to be considered is the personality of the people raising the child (mostly the parents). An abusive parent or a suicidal one will likely have a huge impact on the behaviour of the child in the future. He/She is most likely be traumatized and might even copy the behaviour of the people raising him/her. <em>Violence breeds Violence</em>.</p>
<ul>
  <li>The <strong>Imposed Values</strong> he was raised in</li>
</ul>
<p>What you teach a child at an early age will be his/her basis for what is right or good. If you impose on a child that "stealing", "cheating" or "lying" is wrong. Then at an early age, he will try his very best not to do those things. The lesson one learned as a child is likely what he will live for in the future.</p>
<p>You might be wondering why I am focusing mostly on how a child is <strong>raised during early childhood</strong>. This is mostly because at this age is where a child's personality will likely form. It is at this time that he starts to differentiate right from wrong and will mostly try to adapt base on this common factors.</p>