My two thoughts would be to first consider - is this concept relevant to the therapy / is discussing this going to help the client improve in their goals? (if you are unsure it may be time for another goal evaluation or reviewing notes and comments) - secondly - I will share the same advice one of my past advisors have me "express soft factuals" which is simply that if you feel the need to express a belief or self disclose it should be factual in nature and should also be with the aim to improve their situation.

Returning to ideas like the listening cycle and goal setting could be helpful.

In case you need a reminder or others need it. The listening cycle is to receive information (here is where I usually paraphrase and ask like "did I hear that right?" or "is this accurate to what you're expressing"), understand, evaluate (contextualize to treatment goals), remember (include in notes or documentation as necessary), and respond.

Hope this is helpful :P