Beginning with Paul's letter to the Corinthians, love is patient, kind, it does not boast, is not proud, does not dishonour, is not self-seeking, is not easily angered, keeps no record of wrongs, does not delight in evil, always protects, trusts, hopes and perseveres.
So that is pretty straight forward. There are six things that love is and seven things it is not according to this Biblical passage.
For Will Shakespeare - "love is not love which alters when it alteration finds ... it is an ever fixed mark that looks on tempests ... and is never shaken. You have to be older than twenty to appreciate Shakespeare's instruction. It is an idealistic notion and I can see how this might be true and how it might not. However he does carry some authority because of all the plays he wrote that we still love because his characters resemble a timeless authenticity. He has earned his credibility.
“Being deeply loved by someone gives you strength, while loving someone deeply gives you cour…