The root cause of all negative behavior toward others is "sinas chinam" - feelings of dislike.
On the other hand, the attribute of feeling love for other people generates all forms of positive actions and behaviors. When you plant a small seed, a giant tree bearing delicious fruit will grow. The seed of love for others is a cause whose effect is everlasting bliss! Our forefather Avraham lived with this reality and therefore felt this state of bliss whenever he did acts of kindness for others.
Wouldn't it be wonderful if you felt bliss every time you did an act of kindness for someone? Imagine the uplift and surge of warm energy!
Tonight, before going to sleep, visualize yourself feeling blissful for doing acts of kindness. Eventually you will see kindness in your dreams... and in your everyday reality.
(see Rabbi Yeruchem Levovitz - Daas Chochmah Umussar, vol.1, pp.236-7)