When you approach with love, Krishna reciprocates with love.
Love is tested when you have to sacrifice for the object of love.
God reveals true love to the world through the lives of those who love Him.
Real entertainment is reciprocation of love. That is all the soul needs.
A lot of forgiveness, tolerance, respect, etc. is required in Kali Yuga to breed actual love.
A musician, because one has got a good attachment for music, he tries to perform it very perfectly. So love is the basis. Similarly, when you serve Krishna, if you have no love for Krishna, you cannot serve Him very nicely. Krishna also does not accept your service if it is not done in great love and affection.