speak well for something—give proof in favor of smth.; be strong evidence of smth.:
- His generous gift speaks well for his willingness to help others.
speak well of something—
1. express a good opinion of smth.:
- To speak well of the past was a mortal sin and got you into trouble with the party theologians.
2. = speak well for something:
- His desire to stay with the high-tech program at Cleveland speaks well of his good intentions.