Nothing motivates one to take action in calling to the way of Allah may he be exalted like having the desire in your heart to spread goodness, and you have already achieved a big part of that with proof by beginning to read this book. So, now you are nominated to become a caller in the way of Allah and the possibility that thousands, no rather millions become Muslims due to your Da'wah. If you have the desire in your heart to please Allah and the strong desire to strive in the way of Allah..for who? Picture you are calling to the way of Allah and not to self or a party or a group or a sheikh or business. For, it is a great gain with Allah and there are only profits and no losses.