સમરતાં વાર, બગાડતાં વાર નહીં.

samaratāṁ vāra, bagāḍatāṁ vāra nahīṁ.

Literally: It takes time to build, but no time to ruin.
What it means: Creating or achieving something takes long effort, but destroying it can happen in an instant.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.