When we remember that the heart of Saint Valentine was, like other Christian martyrs, "pierced" by the love of Our Lord, and he shed his blood for this, it seems appropriate that the red heart is a symbol for this powerful love. We think about the power of the love of God - our love for Him and His for us - to inspire our love for others. It is this kind of love that gives heart (or "en-courages") faithful Christians to accomplish deeds of extraordinary courage - even unto death - to bring the truth of faith to others. We are reminded, too, that suffering often accompanies genuine love.
In our Catholic families, we can focus our thoughts, this day, not only in expressing our love for our friends and families (and yes, sweethearts) by gifts and loving greetings; but also in prayer and meditation on Scripture." (Women for Faith & Family)
Most Gracious Heavenly Father, You gave Saint Valentine the courage to witness to the gospel of Christ, even to the point of giving his life for it. Help us to endure all suffering for love of you, and to seek you with all our hearts; for you alone are the source of life and love. Grant that we may have the courage and love to be strong witnesses of your truth to our friends and family and to the whole world. We ask this through our Lord Jesus Christ, your Son, who lives and reigns with you and the Holy Spirit, one God, for ever and ever. Amen.
Valentine of Rome