"And Ruth said, Intreat me not to leave thee, or to return from following after thee: for whither thou goest, I will go; and where thou lodgest, I will lodge: thy people shall be my people, and thy God my God..." (Ruth 1:16)
As bleak as things were after the deaths of her father & brother in laws and of her own husband, why did Ruth insist on staying with Naomi? What made Ruth so sure that being with Naomi was the right thing for her to do? It seems that it would have been more reasonable for her stay in Moab, as her sister did, to find another husband.
As with much in the Bible, we can speculate and pray for understanding, but we can't know Ruth's thought process (without being able to ask her). Was Ruth's decision impulsive or well reasoned & planned or somewhere in between, guided by God? Ruth certainly didn't hem and haw over this major choice point in her life, which leaves me wondering, when a tough choice is easy to make, is it preordained? Ruth's strong commitment to her family by marriage led to an 'out of the ordinary' type of union between her and Boaz which eventually (31 generations later) led to the magnificent birth of Jesus. I know ... wow, right? AMEN!