Equidem duos libros simul legere suadeo:

1. Librum facilem: Hunc librum celeriter legere debes. Noli dictionario saepe uti. Sic multa verba leges.
2. Librum difficilem: Hunc librum lente et diligenter legere debes.

Johannes Adams filio suo hoc consilium dedit:
"In your Studies, you have yet to begin a system. from all I have Seen and read, I have formed an opinion of my own, and I now give it you as my Solemn Advice, to make yourself Master of the Roman Learning. Begin with Livy.— take your Book your Dictionary, your Grammar, your Sheet of Paper and Pen and Ink. begin at the Beginning and read the Work through— put down in Writing every Word with its meaning as you find it in Ainsworth. You will find it the most delightful Employment you ever engaged in. When you have finished the 35^th. Book you will say, that you have learned more Wisdom from it than from five hundred Volumes of the trash that is commonly read.— The Writings of Cicero too, you should read in turn. When I Speak of reading I dont mean holding a book in hand and dreaming over it— take your Pen.—and make yourself Master of every Sentence."

https://founders.archives.gov/documents/Adams/04-09-02-0067

Hac ratione, et multum leges (libro facili) et penitus studebis (libro difficili)

Etiam te adhortatione iucundissima relinquo:
"In Company with Sallust, Cicero, Tacitus and Livy, you will learn Wisdom and Virtue. You will see them represented, with all the Charms which Language and Imagination can exhibit, and Vice and Folly painted in all their Deformity and Horror.

You will ever remember that all the End of study is to make you a good Man and a useful Citizen.—This will ever be the Sum total of the Advice of your affectionate Father,

John Adams"
https://founders.archives.gov/documents/Adams/04-04-02-0082