The hands of Brahmanas are (the portion of) the thunder; the chariots of the Kshatriyas are (also the portions of) the thunder. The charity of the Vaishyas are (also the portions of) the thunder and the services of the Shudras are (also the portion of) the thunder.
वज्रपाणिर्ब्राह्मण: स्यात् क्षत्रं वज्ररथं स्मृतम्। वैश्या वै दानवज्राश्च कर्मवज्रा यवीयसः॥