量力而行

量力而行[为] [liàng lì ěr xíng]

1. ■ act according to one's ability [capability]; act after [under] calculating one's resources; do as much as one's resources, strength, etc. permit; do what is possible; do what is within one's means; do what one is capable of; do what one's strength allows; estimate [figure out; evaluate] one's strength before acting; not over-reach oneself in one's attempts; within the limit of our resources