Here are some of Macarius most renowned sayings:
“Abba Marcius said, 'If you rebuke someone and do it with anger, you have allowed a passion to control you. You have not saved anyone and have destroyed yourself'.”
"The soul that, prepared by the Holy Spirit to be his seat and house, and found worthy to participate in his Light, is illuminated by the beauty of his ineffable glory, becomes all light, all face, all eyes; there is no part of her that is not full of these spiritual eyes of light. That is to say no part of her is in shadow, but she is entirely transformed into light and spirit and is all full of eyes and has neither a part behind or a part in front but appears all face because of the ineffable glory of the Light of Christ, that has descended on her and lives with her...
If then you have become the throne of God, and the Heavenly Charioteer has seated himself within you, and your soul is entirely transformed into a spiritual eye, and is made into light; if you too are nourished with the heavenly food of that spirit and have drunk of the Living Water, and have put on the secret garment of light - if your inward being has experienced all these things and is established in rich unshakable faith, then you are living the Eternal Life, and your soul even in this present time rests with Christ."
The orthodoxwiki has a good amount of information on his life.
Brianica has a great short article on Marcius life titled Macarius the Egyptian.
Here is a short video with some of Macarius' sayings.
This is a video recount of Macarius life through the writings of Palladius read aloud (there are others remembered in this video too but Macrius is at the begnining)
And this video is a full audio book of 50 of Macarious' homilies - spanning 11 hours worth of listening. This one might be a good one to do while taking exercise or cleaning your home!