Mention one Hadeeth Qudsi on the virtue of Ramadhaan. 
The Messenger of Allah, may Allah exalt his mention and grant him safety, said: Allah, The Mighty and Majestic, said:
Every act of the son of Adam is for him, except fasting. It is meant for Me, and I will reward for it. Fasting is a shield. When any one of you is fasting on a day, he should neither indulge in obscene language, nor raise a voice. If anyone reviles him, or tries to quarrel with him, he should say: I am a person fasting.
By Him, in Whose Hand is the life of Muhammad, the breath of the observer of fast is sweeter to Allah, on the Day of Judgment, than the fragrance of musk.
[al-Bukhaaree and Muslim]
: See “Twenty Questions for Children on Fasting, Laylatul-Qadr, and al-‘Itikaaf”, by: Arafaat b. Hasan al-Muhammadee.