A proverb warning not to assume that parents and money will last forever — don't rely on them indefinitely.
親からの仕送りに甘えすぎず、いつまでもあると思うな親と金を心に留めて働き始めた。
Not wanting to rely too much on money from his parents, he started working keeping the proverb 'parents and money won't last forever' in mind.
旅行先で贅沢しすぎてはいけないよ。いつまでもあると思うな親と金だ。
Don't splurge too much on the trip. Remember, parents and money won't last forever.