Dhamma Primer Vol.9 chapters 67-90 

Meditation and Its Benefits
A Bhikkhu Who Is Not Devoid of Jhāna
Bhikkhus, if for just the time of a finger snap a bhikkhu develops mindfulness of breathing, he is called a bhikkhu who is not devoid of jhāna, who acts upon the teaching of the Teacher, who responds to his advice, and who does not eat the country’s almsfood in vain. How much more, then, those who cultivate it!”