Problem:
The law of non-contradiction as stated by Aristotle: "It is impossible for the same thing to belong and not to belong at the same time to the same thing and in the same respect"
https://plato.stanford.edu/entries/aristotle-noncontradiction/
According to Allan Bloom, "the earliest-known explicit statement of the principle of contradiction - the premise of philosophy and the foundation of rational discourse" - is given in Plato's Politeia (The Republic) where the character Socrates states, "It's plain that the same thing won't be willing at the same time to do or suffer opposites with respect to the same part and in relation to the same thing".
https://en.wikipedia.org/wiki/Principle_of_contradiction
The example I'll give regards selfishness.
I have three sons ages 16,15, and 11. I am a husband, married to the same woman for the last 18 years. I am a teacher with many students looking at me for guidance and examining my life. One my favorite sayings that I use with my family, friends and students is "It's not about you." I believe that life is to be lived for others. The Golden Rule states that we should "do unto others as we would have them to do to us." In other words, we should treat others as we want to be treated. Jesus gave his disciples the Great Commandment in Matthew 24:36-40 36"Teacher, which is the greatest commandment in the Law?" 37Jesus replied: " 'Love the Lord your God with all your heart and with all your soul and with all your mind.'[a] 38This is the first and greatest commandment. 39And the second is like it: 'Love your neighbor as yourself.'[b] 40All the Law and the Prophets hang on these two commandments."