“I don’t know.”
The best thing you can say, habitually, when confronted with doubt is “I don’t know.”
I don’t want to presume that I know much as a matter of fact. Not knowing leaves room for all types of questions, dialogue, conversation, and understanding. I am often too quick to assume, jump to a conclusion, and make a decision or take a stance that isn’t built on multiple perspectives. I hope to grow by saying “I don’t know” even more than I do now, despite the appearance I may think it gives.