'Be Careful' in the Bible

For he shall be as a tree planted by the waters, that spreadeth out its roots by the river, and shall not fear when heat cometh, but its leaf shall be green; and shall not be careful in the year of drought, neither shall cease from yielding fruit.

Faithful is the saying, and concerning these things I desire that thou affirm confidently, to the end that they who have believed God may be careful to maintain good works. These things are good and profitable unto men: