Your own true determination!
Joy, happiness and love does not create true and long lasting determination, it only creates an easy determination.
True determination lies within you, no one else can give it to you. Learn to channel your guilt, regrets, sadness and anger properly, and you will get all the determination you will ever need. Your own determination specifically created for you by you...
Don't waste your anger and sadness on others. Learn to channel it within yourself to get true determination.