Focus on the positives. Don't reveal anything that would paint you in a negative light. If there were reasons that might sound defamatory towards yourself or others, try to keep those details to yourself. For example, when someone has outgrown a position, and it isn't advancing their career, looking for career growth elsewhere reveals a dedication to one's well-formulated career plans. Showing professional appreciation for what you gained from your previous employers can go a long way toward exhibiting emotional maturity.

"My previous employer helped me incredibly since I started with them, but the growth opportunities are no longer a viable option for me. So, it is with mutual respect and gratitude that I left them. I gave them almost two months' notice and helped train my successor. I strongly believe that work relationships should last."