| principle(noun, support, action, base, beginning) |
| proof(noun, support, action, base, beginning) |
| quintessence(noun, substance, heart, soul, focus) |
| reality(noun, substance, heart, soul, focus) |
| reason(noun, support, action, base, beginning) |
| root(noun, support, action, substance, base) |
| rudiment(noun, support, action, base, beginning) |
| sanction(noun, support, action, base, beginning) |
| security(noun, support, action, base, beginning) |
| soul(noun, substance, heart, focus, details) |
| source(noun, support, action, base, beginning) |
| starting point(noun, expression, base, beginning, source) |
| substance(noun, heart, soul, focus, details) |
| substratum(noun, support, action, base, beginning) |
| support(noun, action, base, beginning, source) |
| theorem(noun, support, action, base, beginning) |
| theory(noun, support, action, base, beginning) |
| underpinning(noun, support, action, base, beginning) |
| warrant(noun, support, action, base, beginning) |
| apriorism(theory, guesstimate, premise) |