Unconditional love is the most positive and powerful thing one can do in his/her life. It's beyond selflessness, it takes you to a stage where you fall in love without any expectation and self benefit. It's the purest form of love.
It helps you evolve as a person, you start to believe in your inner power. You begin doing things, you have never done before. You become emotionally attached towards everything happening around you, and that helps you build your inner strength. Law of attraction states, you attract what you feel, and unconditional love helps you feel positive about everyone and everything.