This quote belongs to Napoleon Hill, born Oliver Napoleon Hill (1883 - 1970).
Do not let past failures hold you back and keep you from future fulfilment and satisfaction. You are standing at the threshold of your new life. You have to work hard with a non-stop effort to gain the strength needed to heal your heart from disturbing doubts. Whatever situation you are in, you can get yourself out by taking a simple step of faith to change your life for the better today.