Authors:

If it's a principle, it's a winner. If it's a tactic, it's a loser.

Zig Ziglar, Krish Dhanam, Bryan Flanagan, Jim Savage (2004). “Top Performance: How to Develop Excellence in Yourself and Others”, p.70, Revell
If it's a principle, it's a winner. If it's a tactic, it's a loser.