When you find something that excites and enthuses you, you want to tell people about it and spread the news. When it is a spiritual matter it can be a more delicate situation, wanting to be enthusiastic without being evangelical or overbearing.
My go to book, as we all know, is The Buddha, Geoff and Me, beautifully simple, brilliantly written and, for me at least, a life changer. So to make a present of the book, to someone you care about, might be an idea.
That way, you show you care, you pass on the idea , but you don’t force the issue. If they are interested they may choose to read it. They also have the chance to pass on the news at a later date, if they so decide. And so the good news spreads.