Training: Training denotes the missionary program sent by Allah and it is related to Him.

And teaches them the Book and the Wisdom. (Surah Jumah 62:2).

This portion of the verse shows that training is related to two things,
'Book' and 'Wisdom'. Actually both are one and the same. 'Book' means
the knowledge of the Holy Quran and wisdom denotes the secret of the
creation of the Universe. In other words 'Book' is the codification of religious
law and 'Wisdom' means the realities connected with creation of
the universe and it is related to natural factors. For example the

Almighty has created the universe. Now this is not a religious command.

Therefore, one who intends to acquire perfection and righteousness
must strive for Quranic knowledge. One should study it and act upon it.
The verses regarding the oneness of Allah, His names, attributes and
Divine acts must be studied with concentration and through this exercise
we must strengthen our basic beliefs. We must also pay attention to the
laws of Shariah. We must perform obligatory acts and shun prohibited
ones. We must also ponder on the verses with regard to Day of Judgment.
Through these verses each one of us must create a longing for
Paradise and a fear of Hell. In this way a man is gradually persuaded to
perform good deeds and distance himself from evil deeds.

There are many verses of the Quran concerning wisdom and which
cannot be understood by the five senses of man. A study of these verses
indeed tells man regarding his origin and his destination. What is the
aim behind the creation of man and other creatures? And why they subsequently
leave the world? What is the purpose of designing and devising
the long caravan of creatures and created things? The reply to the
questions is the foundation of Quran.

-Ayatullah Shaheed Dastaghaib Shirazi Ref: Book, Qalbe Saleem, advice of training.