Vaishnava Samhita. Sakshi Gopala Charitam. Vol III Book VI Chp 23 Shlokas 1 - 2

श्रीसद्गुरुरुवाच 
साक्षी सर्वस्य लोकस्य वर्तते भगवान् हरिः |
तत्तत्कर्मफलं यच्छन् सर्वत्र समदर्शनः ||
न तस्य शत्रुर्मित्रं वा कृष्णस्य समदर्शिनः |
फलं कर्मानुरूपं हि तस्माद्भेदो हि दृश्यते ||

Shri Sadguru said

Bhagavan Shri Hari, is the all perceiving witness. Without any discrimination He bestows on all the fruit of their actions. Shri Bhagavan looks at all with an even eye. He does not have liking or dislike for anyone. All differences found in the world are due to the karma of men.