Alternative form of why buy a book when you can join a library

Do not expect somebody to make a costly commitment if it will give them nothing they do not already have; used especially as a warning against having sexual intercourse before marriage.

Synonym of if all you have is a hammer, everything looks like a nail

Synonym of if you find yourself in a hole, the first thing to do is stop digging

It is easy to lose sight of one's initial objective, becoming caught up in subtasks or in tasks only tangentially related to the original goal.

(archaic, formal or literary) From where; from which place or source.

(literary, poetic) Used for introducing the result of a fact that has just been stated; thence

At any time that. / At the (single) time that, no matter when. / Every time that. / Regardless of the time that. / (Ireland, regional US, nonstandard) When.

(interrogative) When ever: emphatic form of when. / At any time.

(dialectal, poetic) Contraction of whenever.