A thought which does not result in an action is nothing much, and an action that does not proceed from a thought is nothing at all.

Ideas matter only when they are lived, and actions matter only when they have a reason behind them. Bernanos sets two failures side by side: the person who reflects endlessly and never moves, and the person who busies himself without knowing why. The first leaves thought as decoration, "not much" but still something, since an idea can at least be a seed. The second is "nothing at all," because action cut off from judgment is just motion, and it can easily do harm.

This fits a Catholic outlook in which faith must show itself in works, and also the older philosophical idea that wisdom is practical. Bernanos was a French Catholic novelist who spoke out against injustice even when his own side committed it, so for him thinking and acting were a matter of conscience. The exact source of the wording is hard to pin down, so treat the phrasing with some caution.

Suppose you keep thinking you should check in on a lonely relative. The thought alone changes nothing. But a frantic burst of visits you never considered, which leaves you resentful and exhausted, helps no one either. Ask what that person actually needs, then settle on a modest weekly phone call and keep it.