Friday is the Feast of St. Thomas Aquinas. Here is a brief snippet from Fr. Barron.
Here is the link to a brief bio of St. Thomas
Here you can find some of Thomas' writings online for free:
If you own a Kindle (or use the free Kindle Reader software on your PC, Android, iPhone, or iPad) you can download many of St. Thomas' writings (and tons of other classic Catholic works) for free or under $1. If comparing different versions of the same book, look for "indexed".