"He gave Himself for us unworthy wretches? And being God, what better gift could He offer than Himself? Hence, if one seeks for God's claim upon our love here is the chiefest: Because He first loved us (I John 4:19)" - St. Bernard of Clairvaux "On Loving God". Chapter I, 5.
"So it behoves us, if we would have Christ for a frequent guest, to fill our hearts with faithful meditations on the mercy He showed in dying for us, and on His mighty power in rising again from the dead. ... surely there is proof enough and to spare in that Christ died for our sins and rose again for our justification, and ascended into heaven that He might protect us from on high, and sent the Holy Spirit for our comfort. Hereafter He will come again for the consummation of our bliss. In His Death He displayed His mercy, in His Resurrection His power; both combine to manifest His glory." - St. Bernard of Clairvaux "On Loving God". Chapter III, 5.
"What could result from the contemplation of compassion so marvelous and so undeserved, favor so free and so well attested, kindness so unexpected, clemency so unconquerable, grace so amazing except that the soul should withdraw from all sinful affections, reject all that is inconsistent with God's love, and yield herself wholly to heavenly things? No wonder is it that the Bride, moved by the perfume of these unctions, runs swiftly, all on fire with love, yet reckons herself as loving all too little in return for the Bridegroom's love. And rightly, since it is no great matter that a little dust should be all consumed with love of that Majesty which loved her first and which revealed itself as wholly bent on saving her. For 'God so loved the world that He gave His only-begotten Son, that whosoever believeth in Him should not perish but have everlasting life' (John 3:16). This sets forth the Father's love. But 'He hath poured out His soul unto death,' was written of the Son (Isa. 53:12). And of the Holy Spirit it is said, 'The Comforter which is the Holy Ghost whom the Father will send in My name, He shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you' (John 14:26). It is plain, therefore, that God loves us, and loves us with all His heart; for the Holy Trinity altogether loves us, if we may venture so to speak of the infinite and incomprehensible Godhead who is essentially one." - St. Bernard of Clairvaux "On Loving God" Chapter IV, 5.