Jn 3:16-18
God so loved the world that he gave his only Son, so that everyone who believes in him might not perish but might have eternal life. 17For God did not send his Son into the world to condemn the world, but that the world might be saved through him. 18Whoever believes in him will not be condemned, but whoever does not believe has already been condemned, because he has not believed in the name of the only Son of God.
God so loved the world that he gave his only Son. What have you done in the name of love? What have you sacrificed for a loved one? What have you truly and freely given for a beloved? And you have given not to condemn or to collect or to get recompense, but simply to express your love! Have you experienced being so much in love that you will do anything for love or for the person you love?
If you have experienced this love-giving, to the point of giving not only what you have or who you are but your only heart, then it will be easy to understand the Father. It will also be very natural to know the Son and very close to feel the Holy Spirit. For the Trinity simply means a love-giving relationship.
The Trinity is God who “reinvents” himself as Father who made everything, as Son who gave everything, and as Spirit who reminds us of this love-giving God.