Jesus Christ is true God and true man. As God, His divine intellect possesses infinite science. As man, His intellect possesses beatific science, infused science, and acquired science.

The beatific science and infused science in Christ are the results of the union of divinity and humanity. Beatific science consists in seeing the divine essence. Infused science consists in knowing, like the angels, by means of infused ideas, without sensible images and without reasoning.

Acquired science consists in apprehension by means of senses and reason. This is the kind of wisdom that increased with age. “Jesus increased in wisdom and age and grace with God and men” (Lk 2:52).

Growing in wisdom and grace can also be understood in the sense that the wisdom and grace which Christ possessed in all their fullness from the beginning were manifested externally only by degrees, in proportion to His growth.

Lessons of hidden life

Jesus Christ lived 33 years on earth: 30 years of hidden life and three years of public life.

The hidden life of Jesus in Nazareth was a life of humility, silence, prayer, obedience, and labour.

One catechism states that by His hidden life, Jesus teaches us:

1. that man’s worth in God’s eyes is measured not by the greatness of his fortune or his works, but by his interior perfection.

2. that the apostolic man should be formed in retreat and prayer.

Teachings of Christ

Christian doctrine may be divided into dogma, moral teaching, and worship. Our Lord sums up these three things in the words: “I am the way, and the truth, and the life” (John 14:6). Christ is the truth that we must believe, the way that we must follow, and the life that we must live.

In the area of dogma, Christ reveals to us the mystery of the Holy Trinity. He teaches us that He himself is the Saviour of mankind. He makes known to us that He founded the Catholic Church to bring all people to eternal salvation.

In the area of moral teaching, Christ gives us the Beatitudes as standards of His kingdom. He gives us the commandment of love, saying we should love even our enemies. He also teaches us to love the cross and self-denial.

In the area of worship, Christ teaches us the Our Father. He gives us the seven sacraments. He also teaches us that good prayer requires humility, forgiveness, trust, and perseverance.

Our dear Lord often made use of parables to teach divine truths. These parables may be divided into three classes: the parables of the kingdom of God (e.g. mustard seed, leaven, and hidden treasures), the parables of God’s mercy (lost sheep, prodigal son, and good shepherd), and moral parables (e.g. good Samaritan, marriage feast, and the talents).

Confirmation of teachings

Christ confirmed His teachings by His holiness, miracles, and prophecies.

The holiness of Christ is manifested in His practice of virtues. In His relations with God the Father, Christ practised the virtues of religion, prayer, obedience, and purity of intention. Christ practised charity towards His neighbour. He exercised personal virtues such as prudence, meekness, humility, patience, and mortification.

The Bible records Christ delivering seven possessed persons. He performs 10 miracles upon nature (e.g. changing water into wine, walking on water, two multiplications of loaves, and the transfiguration), 15 upon the sick, and three upon the dead (the daughter of Jairus, the son of the widow of Naim, and Lazarus).

Christ prophesied concerning His own Person (death and resurrection), His disciples, Jerusalem, and the Church, and His prophecies were fulfilled.

“He was teaching them as one having authority” (Mt 7:29).

耶穌基督是真天主又是真人。作為天主，祂擁有無限的智識；作為人，祂擁有真福的智識，傾注的智識和學習得來的智識。

在主基督內的真福智識和傾注智識是天主性和人性結合的果實。真福的智識主要在於瞻仰天主的聖容。傾注的智識在於像天使一般，不需要感官的形象和思想的推理便可得到天主所注入的智識。

學習得來的智識在於以感官和推理去認識事理。這一種的智慧按年齡增長。「耶穌在智慧和身量上，並在天主和人前的恩愛上，漸漸地增長。」(路 2:52)

智慧和恩愛上的增長也可指耶穌自始就有的完滿恩寵和智慧，隨着年齡的增長，逐漸地顯露出來。

隱居的生活

耶穌基督在世三十三年；三十年隱居的生活，三年公開的傳教生活。

耶穌在納匝肋渡着謙遜，寧靜，祈禱，服從和勞動的生活。

耶穌的退隱生活教導我們：

第一，在天主眼中，一個人的價值，並不在於他的成就或工作的重要，而是在於他內在的成聖。

第二，一個從事使徒工作的人，是應以祈禱和退隱來培訓出來的。

基督的教導

基督徒的道理可分為教義，倫理和欽崇。主耶穌把這三項結合為一句名言「我是道路、真理、生命」（若14：16）。基督我們應相信的真理，我們應跟隨的道路，和我們應活出的生命。

在教義方面，主耶穌啟示給我們，天主三位一體的奧秘。祂教導我們祂自己就是人類的救主。祂讓我們知道祂建立了天主教會帶領眾人得到永遠的救恩。

在倫理方面，主耶穌教導我們的真福八端，是祂王國的標準。祂給我們愛的誡命，甚至要我們愛仇人。祂也教我們去愛十字架，去棄絕自己。

在欽崇方面，主耶穌教導我們唸『天主經』。祂給我們建立了七件聖事。祂也教導我們善作祈禱的要素——謙遜、寬恕、信賴和恆心。

主耶穌屢屢以比諭教導我們神聖的道理。這些比諭可分三類：天國的比諭（例如芥末的種子，酵母和隱藏的寶藏），天主慈悲的比諭（迷失的羔羊，浪子回頭和善牧的故事）和倫理的比諭（例如慈善的撒瑪利亞人，婚宴和塔冷通的比諭）。

教導的證明

基督以祂的聖德，奇跡和預言來證明自己的教導是真實的。

基督的聖德由祂實踐的各種德行中表達出來。祂向天父實踐了宗教、祈禱、服從和純正意向的德行。祂向近人實踐了仁愛之德。祂自己實踐了明智、温良、謙遜、和忍耐的德行。

聖經中記錄了耶穌曾經從七個附了魔的人身上驅逐魔鬼。行了十個自然界中的奇跡（例如：將水變成酒，兩次的增餅，顯示聖容），十五次治好疾病，三次使死者復活（會堂長的女兒，寡婦的兒子和拉匝錄）。

耶穌說了有關祂自己（死亡和復活）、祂的門徒、耶路撒泠和聖教會的預言。祂的預言都應驗了。

「祂教訓他們，正像有權威的人。」（瑪7:29）