The Apostles preached not only the doctrine of the Trinity, but also that the Most Holy Trinity loves each of us and desires our salvation. "For God so loved the world that he sent his only Son, so that everyone who believes in Him might not perish but might have eternal life." (John 3:16)
Consider the love of God the Father in creating you. He made you not because of any merits of your own, but simply because of his love for you. He does not love you because you are good, but his love makes you to be good. And the Father's love is seen throughout the Old Testament.
Consider the love of God the Son in redeeming you. He desired to live among us and to be one of us so that we might know how much he loves each of us. While he was on earth, Jesus was nothing but merciful, gentle and loving with us.
Consider the love of God the Holy Spirit in sanctifying us. He lives within us and is active in us. We do not know how to prayer, so he prays in and through us. We do not know how to speak up for the faith, so he speaks in and through us. He guides the Church and keeps her true throughout all time.
Finally, the love of the Father and the Son and the Holy Spirit is shown in the three sacraments of Baptism, Eucharist, and Confirmation.
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