'Endless' in the Bible

My son, be careful {about anything beyond these things}. For the writing of books is endless, and too much study {is wearisome}.

Why is my pain endless, and my wound incurable? It refuses to become healed. Truly you are to me like a deceitful [brook], waters [that] are not trustworthy.

There is no healing for your wound; your injury is fatal. All who hear the report of you will clap [their] hands [for joy] concerning you, {For who has not suffered at the hands of your endless cruelty}?