So the next time you use or hear the word love, think about how loaded it actually is. Ponder how you would prove it. Are you willing to die for the next person you say "I love you" to? When someone else says they love you or something, ask them what they would give up to demonstrate that. It's a legit question since they are openly making a claim of epic proportions (even if they are ignorant about it).
For Christians, the definition of love is provided in 1 Corinthians 13; this also serves as our instruction manual. The Apostle Paul laid it out like this in verses 4 through 6:
4 Love is patient, love is kind. It does not envy, it does not boast, it is not proud. 5 It does not dishonor others, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. 6 Love does not delight in evil but rejoices with the truth. 7 It always protects, always trusts, always hopes, always perseveres.